Rare 20 Cent Coins Australia: The Ultimate Collector’s Guide

Australia’s 20 cent coin has been an important part of the nation’s decimal currency since 14 February 1966. Millions of these familiar coins have circulated through Australian pockets, shops and banks, yet not every 20 cent piece is simply worth face value. Certain dates, varieties, minting errors and exceptionally well-preserved examples have become highly desirable among collectors.

For anyone searching for rare 20 cent coins Australia has produced, the challenge is knowing what to look for. A coin may appear ordinary at first glance but contain a small design difference that dramatically increases collector interest. The famous 1966 Wavy Baseline 20 cent is the best-known example, while low-mintage dates such as 1971 and 1985, unusual 1981 varieties and genuine mint errors also deserve attention.

This guide explains the history, mintages, major varieties, errors, grading factors and practical methods collectors can use when searching for valuable Australian 20 cent coins.

History of the Australian 20 Cent Coin

Australia changed from pounds, shillings and pence to decimal currency in 1966. The new denominations included 1 cent, 2 cent, 5 cent, 10 cent, 20 cent and 50 cent coins, together with decimal banknotes.

The original Australian 20 cent reverse was designed and sculpted by renowned artist Stuart Devlin. It depicts a platypus swimming through water, accompanied by the denomination “20”. The design became one of the most recognisable images on Australian decimal coinage.

The standard 20 cent coin is composed of 75% copper and 25% nickel. It has a diameter of approximately 28.65 millimetres, weighs about 11.3 grams and has a milled edge.

Over the decades, different portraits of the reigning monarch have appeared on the obverse. Commemorative designs have also occasionally replaced the traditional platypus reverse.

For collectors, however, some of the greatest interest lies in small production differences that were never intended to create entirely new coin designs.

Important Australian 20 Cent Coin Mintages

Mintage is one of the first factors collectors examine when assessing the potential scarcity of a coin. A lower mintage does not automatically guarantee high value, because survival rates, collector demand, condition and varieties also matter.

Collectors should remember that the number originally struck is only part of the story. Some coins may have been heavily circulated and lost, while others were preserved by collectors from the beginning.

1966 Wavy Baseline 20 Cent Coin

The 1966 Wavy Baseline 20 cent is arguably the most famous Australian 20 cent variety.

Around 58.2 million 20 cent coins dated 1966 were produced between Canberra and London. Only a tiny proportion of the London-minted coins are believed to show the distinctive Wavy Baseline feature. The exact number produced is unknown.

Identification is relatively straightforward once the correct area is understood.

Examine the large numeral “2” in “20” on the reverse. On an ordinary 1966 coin, the upper edge of the horizontal base of the numeral 2 is comparatively straight. On the valuable Wavy Baseline variety, this edge rises and falls noticeably, creating a wave-like appearance.

Collectors sometimes call this the “Wavy 2”.

The difference may appear small, but it is clearly visible when compared side by side with a normal coin. A magnifying glass or macro photograph can make identification considerably easier.

Because genuine examples are scarce, even circulated Wavy Baseline coins can command significant premiums. Better-preserved specimens may reach much higher prices, particularly when professionally authenticated and graded.

Collectors should avoid assuming that every 1966 coin is valuable. Most are common standard varieties. The Wavy Baseline feature must actually be present.

1971 Australian 20 Cent Coin

The 1971 20 cent is another date worth checking.

Approximately 8.9 million pieces were minted, considerably fewer than many surrounding years. For comparison, approximately 23.7 million were produced in 1970 and about 16.6 million in 1972.

A circulated 1971 coin is not automatically a major rarity, but attractive examples are regularly retained by collectors assembling date sets.

Condition becomes especially important. A heavily worn coin may carry only a modest premium, whereas a sharp uncirculated example retaining strong original lustre is considerably more desirable.

Collectors searching through old coin jars, inherited collections or banked decimal coins should therefore separate any 1971 examples for closer examination.

1981 Three-and-a-Half-Claw Variety

The year 1981 is particularly interesting because Australia needed a very large number of 20 cent coins. Production was shared among the Royal Australian Mint, the Royal Mint in the United Kingdom and the Royal Canadian Mint.

The combined production was approximately 165.5 million coins.

Differences between dies and production methods created identifiable varieties. One of the best known is the Canadian-produced 1981 “three-and-a-half claw” variety.

Examine the platypus claws closely. On the Canadian variety, one claw appears shortened, producing the appearance collectors describe as three-and-a-half claws. Characteristics of the lettering and edge may also assist specialists in attribution.

The 1981 coin demonstrates an important principle of Australian coin collecting: a high-mintage year can still contain interesting varieties.

Collectors should therefore look beyond the date alone.

1985 Australian 20 Cent Coin

The 1985 20 cent is a classic low-mintage Australian decimal coin.

Only about 2.7 million standard 20 cent coins were produced that year, compared with approximately 27.8 million in 1984. No standard 20 cent coins were produced for circulation in 1986 or 1987.

Because of its comparatively small production, 1985 has long attracted collectors completing Australian decimal date sets.

Circulated pieces can still occasionally be encountered, but coins in superior condition are more desirable. Look for examples with strong detail in the platypus, minimal marks in the open fields and good original surface lustre.

Do not clean a 1985 coin simply because it appears dark or dull. Cleaning can permanently alter the surface and reduce its numismatic desirability.

The Unusual 1988 20 Cent Mintage

One of the most surprising figures in the official Australian 20 cent mintage record is 1988.

The standard platypus issue has an official mintage of approximately 200,000 coins, dramatically lower than the 2.7 million recorded for 1985.

That figure makes the year particularly interesting when studying mintage statistics. However, collectors should never determine value using the mintage number alone.

Distribution, survival, whether examples were saved by collectors and the condition of surviving coins all influence real-world scarcity.

The 1988 issue is therefore an excellent reminder that “lowest mintage” and “most valuable coin” are not necessarily the same thing.

2004 Large Head and Small Head 20 Cent Varieties

Modern Australian 20 cent coins can also contain collectible varieties.

In 2004, changes associated with die-production technology resulted in two recognised obverse styles. Collectors commonly describe them as the Large Head and Small Head varieties.

One useful identification feature is the lettering. The Large Head type is associated with pointed-top “A” letters, while the more common Small Head variety has flat-top “A” letters.

Specialist estimates place the circulation Large Head variety at only a small proportion of total 2004 production, making it much more interesting than an ordinary 2004 20 cent coin.

This is another reason serious collectors examine design details rather than looking only at dates.

Rare Australian 20 Cent Mint Errors

Genuine mint errors can sometimes be worth considerably more than normal coins. Their desirability depends on the type of error, how dramatic it is, rarity, condition and authentication.

Known errors can include off-centre strikes, clipped planchets, partial collar errors, multiple strikes, wrong-planchet strikes, broadstrikes and unusual planchet defects.

Wrong-planchet errors are especially dramatic because the 20 cent design may have been struck onto a blank intended for another coin.

Collectors must distinguish genuine mint errors from ordinary post-mint damage. Coins damaged by machinery, tools, chemicals, road surfaces or deliberate alteration after leaving the Mint are normally not collectible mint errors.

If an unusual coin appears potentially important, professional authentication is preferable before assigning a high value.

How Condition Affects 20 Cent Coin Value

Two identical rare coins can have dramatically different values because of condition.

Collectors examine the amount of wear, surface marks, original lustre, strike quality, scratches, corrosion and other damage.

A coin that circulated for decades may show flattened details on the platypus and extensive marks. An uncirculated example may retain sharp design elements and much of its original mint brilliance.

Professional grading services use numerical grading systems to describe preservation more precisely. Certification can be particularly useful for valuable varieties such as a high-grade 1966 Wavy Baseline.

Never polish a potentially rare coin. Polishing removes or alters the original metal surface. Even when a cleaned coin looks shinier to a beginner, experienced collectors generally prefer natural surfaces.

How to Search for Rare 20 Cent Coins

Start by sorting coins according to date. Pay particular attention to 1966, 1971, 1981, 1985, 1988 and 2004.

Next, inspect each coin under strong neutral lighting using a magnifying glass or coin loupe. For 1966, concentrate on the base of the numeral 2. For 1981, inspect the platypus claws and other variety markers. For 2004, examine the portrait size and lettering.

Then check the complete coin for genuine minting abnormalities such as missing sections, unusual strikes or incorrect planchets.

Weighing and measuring suspicious coins can provide additional evidence, although measurements alone cannot authenticate a rare error.

Storing Valuable Australian 20 Cent Coins

Proper storage helps preserve both appearance and potential value.

Coins should be handled by their edges rather than touching the obverse or reverse surfaces. Natural skin oils can leave marks that become difficult to remove.

Use archival-quality coin capsules, flips, holders or albums made from materials designed for long-term numismatic storage. Keep the collection in a stable, dry environment away from excessive heat, humidity and chemical fumes.

For particularly valuable pieces, individual protective capsules are preferable to loose storage.

Are Rare Australian 20 Cent Coins a Good Investment?

Rare coins can appreciate over long periods, but collectibility should not be confused with guaranteed investment returns.

Prices change according to collector demand, rarity, condition, economic circumstances and auction activity. A famous variety in excellent condition may attract strong competition, while an ordinary circulated coin with a supposedly low mintage may generate little premium.

Collectors should therefore focus on authenticity, rarity, condition and historical significance rather than purchasing coins solely because someone predicts future price increases.

Knowledge is one of the best protections against overpaying.

List of Rare 20 Cent Coins Australia (2026 Updated)

Australian 20 cent coins have been an important part of the nation's decimal currency since their introduction on 14 February 1966. Although most 20 cent coins remain worth their face value, several rare dates, mint errors, commemorative issues, and low-mintage varieties have become highly desirable among collectors. The most famous is the 1966 Wavy Baseline 20 Cent, regarded as one of Australia's rarest circulating decimal coin varieties. Other collectible issues include the 1981 Three-and-a-Half Claw Variety, 2004 Pointy "A" Large Head Variety, and numerous commemorative 20 cent coins released since 1995. Values continue to increase depending on rarity, condition, grading, and collector demand. The following 2026 Rare Australian 20 Cent Coin Value Guide provides estimated year-wise collector prices for the most valuable Australian 20 cent coins.

Rare Australian 20 Cent Coins Value List (2026 Updated)

Rare Australian 20 Cent Coins Price Guide (2026)

Note: The values shown above are estimated 2026 collector-market prices and may vary depending on condition, grading, original mint packaging, rarity, and collector demand. Among Australian decimal coins, the 1966 Wavy Baseline 20 Cent remains the most famous and valuable circulation variety, while the 1981 Three-and-a-Half Claw, 2004 Pointy "A" Large Head, 2016 Decimal Currency Anniversary, and 2019 First Jody Clark Effigy issues continue to attract strong interest from collectors building complete Australian 20 cent collections.

2. Historical Background of Decimal Coinage in Australia

Before 1966, Australia used the British-style pounds, shillings and pence. Triggered by the Decimal Currency Act 1965 (Cth), the Royal Australian Mint (RAM) introduced the new decimal system on 14 February 1966. The 20 cent coin—the largest silver-coloured circulating denomination—was struck in cupro-nickel and immediately became popular for everyday transactions. Early mintages ran into the hundreds of millions, making most common-date coins relatively abundant today. However, selective die trials, emergency restrikes and die adjustments gave rise to small runs of “rare” varieties which now command significant premiums.

3. Design, Symbolism & Designers

Obverse: The effigy of Queen Elizabeth II by Arnold Machin (1966–1984) adorns the obverse. Four portraits by different sculptors have been used over time; the Machin portrait remains iconic among collectors for the early decimal issues.

Reverse: The iconic platypus design by Stuart Devlin—featuring Australia’s unique monotreme diving against radiating lines—symbolizes the nation’s distinctive fauna and modern minting artistry.

Symbolism: The platypus embodies Australia’s biodiversity, while the Queen’s portrait acknowledges the Commonwealth’s constitutional monarchy.

4. Minting Processes & Mints Involved

All 20 cent coins of Australia are struck at the Royal Australian Mint in Canberra, with occasional emergency or special issue restrikes at the Royal Mint in London. Production techniques include:

• Master Die Creation: Sculpting and reducing master hub.

• Hub and Die Making: Multiple hubs transfer design details to working dies.

• Blank Preparation: Cupro-nickel planchets punched and annealed.

• Striking: Single or multiple strikes under high pressure.

• Edge Milling: Plain edges milled along with rims.

Die breaks, planchet imperfections and variations in striking pressure are behind many error and variety coins.

5. Key Dates and Low Mintage Years

1966 “Round” 20c Test Strikes

• Background: Early 1966 dies were trialled using round flans before the final scalloped-edged planchets were adopted.

• Survival Rate: Estimated fewer than 50 specimens known, many in institutional collections and museums.

• Value: In mint state, up to AUD 50,000+ for certified specimens.

1969 Red Dot Variety

• Description: A small “red” tin spot on the reverse above the platypus due to incomplete cleaning of planchets.

• Mintage: Estimated 500–1,000.

• Value Range: AUD 200–800 depending on grade.

1970 “Laminated” Error Coins

• Error Type: Lamination flakes on the obverse and reverse, caused by impurities in the planchet.

• Estimated Known: Approximately 200 coins.

• Collector Premium: 100–300% over standard circulated prices.

1972 Small Broad vs Large Broad Rims

• Variation: Two rim widths exist due to die wear and hub pressure adjustments.

• Small Broad Rim Mintage: Approximately 1.2 million; Large Broad Rim: over 10 million.

• Relative Value: Small Broad Rim UNC examples can fetch AUD 150–300.

Other Notable Variants

• 1973/1974 Mules: Reverse from another denomination mistakenly paired—extremely rare.

• 1981 Specimen Issues: Struck on specially treated planchets for prooflike finish; limited to presentation sets.

6. Major Error Coins & Varieties

Off‑Centre Strikes

• Characteristics: Design displaced off the centring line; can range from slight (10–15%) to dramatic (over 50%).

• Rarity: Off‑centre errors above 20% displacement are scarce and highly sought.

• Values: Slight errors (AUD 50–100), dramatic errors (AUD 500+).

Double Strikes & Rim Clips

• Double Strikes: Multiple impressions produce ghost images of the design.

• Rim Clips: Planchet missing a wedge-shaped section.

• Premiums: Up to 10–20× face value depending on severity.

Planchet Flaws

• Lamination Flaws: Flaking metal layers.

• Broadstrike & Understrike: Weak or missing rim definition.

• Cuds & Die Breaks: Raised blobs of metal where die fragments break off.

7. How to Identify Authentic Rare 20 Cent Coins

1. Weight & Diameter: Use calibrated scales (11.30 g ± 0.10 g) and callipers (28.52 mm diameter). 1966 test strikes may differ.

2. Die Markers & Mintmarks: Look for red dot, dot over date (DOD) or privy marks on special issues.

3. Edge and Rim Examination: Off‑centre, broadstrike, clip severity. Compare with known reference photos.

4. Design Details: Sharpness of platypus lines, radiating fields, portrait hair details.

8. Coin Grading & Condition Importance

• Grading Scales: Sheldon scale (Poor–Mint State). Australian collectors commonly use UNC, EF (Extremely Fine), VF (Very Fine), etc.

• Uncirculated (UNC/Bu): Original lustre intact, no wear on high points.

• Proof & Specimen: Mirror‑like fields with frosted design; sold in RAM presentation packs.

• Certification: PCGS, NGC and RCM services provide grading, encapsulation, and guarantee authenticity.

9. Market Values & Price Guide (By Condition)

Values as of April 2025; individual auction results may vary.

10. Investing in Rare 20 Cent Coins

Building a strong collection requires balancing rarity, condition and budget. Key strategies include:

• Diversification: Include high‑grade examples and error varieties.

• Research: Study auction catalogues and price guides regularly.

• Certification: Insist on graded coins to avoid counterfeits and inflated grades.

• Patience: Rare coins often appreciate over long holding periods.

11. Buying and Selling Channels

• Major Auction Houses: Spink Australia, Heritage Auctions, Noble Numismatics.

• Local Dealers & Coin Shops: Seek those with coin grading services.

• Online Platforms: eBay, Collectables.com.au, Forum Auctions.

• Coin Shows & Clubs: Royal Australian Numismatic Society events offer peer networks.

12. Caring for Your 20 Cent Coin Collection

• Storage: Airtight holders, coin flips or acid‑free folders.

• Handling: Wear nitrile gloves; hold by edges only.

• Cleaning: Never clean coins with abrasives; use mild distilled water rinse if necessary.

• Environmental: Store in cool, dry, dark conditions to prevent toning and corrosion.

13. Frequently Asked Questions (FAQ)

Q1: How can I tell if my 1969 coin is the red dot variety?
A: Inspect the reverse near the platypus tail for a tiny red oxide spot—visible under magnification.

Q2: Are off‑centre coins real money?
A: Yes; they remain legal tender, though trading value is based on rarity and severity of the error.

Q3: Should I clean my rare 20c coins?
A: Cleaning can damage surfaces and reduce value—avoid cleaning unless advised by a professional.

Q4: Where can I get my coin graded?
A: Use PCGS, NGC or Australian Numismatic Grading (ANG) for certification.

Rare 20 Cent Coins Australia: Frequently Asked Questions for Collectors

Introduction: Why 20 Cent Coins Are a Collector’s Favorite

The 20 cent coin is one of Australia’s most iconic circulation coins, first issued in 1966 following the decimalisation of Australian currency. While the majority of 20 cent coins are common, certain issues are considered rare and highly collectible, commanding significant premiums among numismatists.

Rare 20 cent coins are valued for mint errors, low mintage, historical significance, and unique design features. Collectors seek them both for personal enjoyment and investment potential.

This guide provides answers to the most frequently asked questions about rare 20 cent coins in Australia, covering history, identifying rare issues, valuation, collecting tips, grading, and storage.

Frequently Asked Questions About Rare 20 Cent Coins in Australia

1. When was the Australian 20 cent coin first issued?

The 20 cent coin was introduced on 14 February 1966, during Australia’s transition to decimal currency. It replaced the pre-decimal florin and was made from cupronickel, featuring Queen Elizabeth II on the obverse and the iconic platypus design by Stuart Devlin on the reverse.

2. Why are some 20 cent coins considered rare?

Rare 20 cent coins may be valuable due to:

• Low mintage or limited production

• Minting errors (double strikes, off-center strikes, die cracks)

• Historical or commemorative significance

• Unique variations in design or metal composition

Collectors often hunt these coins for both numismatic and investment value.

3. What are the most famous rare 20 cent coins?

Notable rare 20 cent coins include:

• 1966 20 Cent Coin (initial release) – First year of issue, sometimes with low minting errors

• 1972 20 Cent Coin “Small Date” – Rare date variety

• 1973 20 Cent Coin “Rivet Error” – Minting anomaly

• 1981 20 Cent Coin – Low mintage in some mint marks

These coins can fetch premiums far above face value when in uncirculated or proof condition.

4. How can I identify a rare 20 cent coin?

Look for:

• Date and mint mark variations

• Errors such as off-center strikes, doubled dies, or missing elements

• Condition – uncirculated or proof coins are significantly more valuable

• Weight and dimensions – anomalies may indicate rarity

Consult official guides, auction listings, and numismatic catalogs to verify rarity.

5. Are rare 20 cent coins legal tender?

Yes, they remain legal tender, but their numismatic value far exceeds face value. Using them in transactions is not recommended.

6. What metals are used in 20 cent coins?

Australian 20 cent coins are primarily made from:

• 1966–1999: Cupronickel (75% copper, 25% nickel)

• 2000–present: Cupronickel for circulation, occasionally proof coins in silver or gold

Metal composition affects weight, appearance, and intrinsic value.

7. What is the difference between circulation and proof 20 cent coins?

• Circulation coins: Produced in large quantities for everyday use; limited collector premium unless rare or error coins

• Proof coins: High-quality finish, mirror-like surfaces, limited mintage, often sold in protective capsules; high collectible and investment value

Proof coins are ideal for serious collectors.

8. Are there 20 cent coins with minting errors?

Yes. Some examples include:

• Off-center strikes

• Double strikes or doubled dies

• Misaligned designs

• Planchet flaws or missing elements

Error coins are highly sought after and often command significant premiums.

9. How rare is a 1966 20 cent coin?

The 1966 issue marked Australia’s first decimal 20 cent coin, making uncirculated examples particularly collectible. Coins with minting errors or perfect condition can be especially valuable.

10. How does condition affect value?

Coin condition is critical. Grading categories include:

• Circulated: Minor wear, lower collector value

• Uncirculated (UNC): No wear, high collectible value

• Proof (PR): Mirror-like finish, perfect strike

• Graded coins (PCGS, NGC): Professionally assessed; graded coins often command higher premiums

11. How do I store rare 20 cent coins?

• Keep coins in protective holders, capsules, or flips

• Avoid direct handling; use gloves

• Store in a cool, dry, low-humidity environment

• Preserve original packaging or certificates if proof coins

Proper storage maintains aesthetic appeal and long-term value.

12. Can rare 20 cent coins be used as investments?

Yes. Rare coins combine numismatic value with potential precious-metal or historical value. Limited mintage and error coins often appreciate over time, making them attractive to investors.

13. How can collectors verify authenticity?

• Examine mint marks and dates

• Verify weight, diameter, and metal composition

• Compare against official numismatic references

• Purchase from trusted dealers or the Royal Australian Mint

• Consider professional grading for high-value coins

14. Where can collectors buy rare 20 cent coins?

• Royal Australian Mint and Perth Mint

• Authorised coin dealers and numismatic retailers

• Online auction platforms

• Coin fairs and expos

Always confirm authenticity and provenance.

15. Are there commemorative 20 cent coins?

Yes. Australia has issued special commemorative 20 cent coins celebrating:

• National anniversaries

• Historical events

• Wildlife and cultural heritage

These limited-edition coins often carry collector premiums above face value.

16. Can error 20 cent coins be valuable?

Absolutely. Coins with errors, such as mis-strikes, doubled dies, or off-center designs, are often worth hundreds or thousands of dollars, depending on rarity and condition.

17. How does mintage affect rarity?

• Lower mintage = higher rarity and value

• Standard circulation coins have millions minted, making them less collectible

• Proof or commemorative issues usually have limited runs, increasing scarcity

Collectors should always check official mintage figures.

18. Can I sell rare 20 cent coins?

Yes. Options include:

• Coin dealers and bullion shops

• Auctions and numismatic marketplaces

• Collector-to-collector sales

Coins in excellent condition or certified by grading services command higher resale prices.

19. How do international collectors view Australian 20 cent coins?

International interest is strong for:

• Rare circulation issues

• Commemorative or proof editions

• Coins with minting errors or limited mintage

Global demand contributes to higher market value and liquidity.

20. Are 20 cent coins suitable for beginners?

Yes. They are:

• Affordable to start a collection

• Easy to store and organise

• Well-documented in numismatic references

• Provide opportunities to learn about minting, grading, and historical significance

21. How do coin grading services assess 20 cent coins?

Grading involves:

• Strike quality

• Surface preservation and luster

• Wear and tear

• Professional scales: MS (Mint State), PR (Proof)

Graded coins offer market credibility and value assurance.

22. What mistakes should collectors avoid?

• Handling coins directly by the surface

• Storing coins in PVC holders (can cause chemical damage)

• Cleaning coins with abrasives

• Ignoring original packaging

• Buying from unverified sources

Avoiding these mistakes preserves condition and market value.

23. How should 20 cent coins be displayed?

• Use protective holders, albums, or display cases

• Avoid direct sunlight, dust, and humidity

• Label coins for year, mint, and any notable errors

• Displaying coins correctly maintains both visual appeal and value

24. Can 20 cent coins be part of an investment portfolio?

Yes. Rare 20 cent coins combine:

• Numismatic premiums

• Potential metal value

• Historical and cultural significance

They are a tangible, low-volume investment asset for collectors.

25. What is the outlook for Australian 20 cent coin collecting?

• Strong interest in rare and error coins continues

• Commemorative and proof issues are increasingly sought after

• Online marketplaces and grading services make collecting and trading more accessible

• Collector awareness and demand are expected to grow, supporting long-term value

Conclusion: Rare 20 Cent Coins Are a Collector’s Treasure

Rare 20 cent coins in Australia represent a unique blend of history, artistry, and investment potential. From the first decimal coins of 1966 to modern commemoratives and error issues, these coins offer collectors a chance to preserve national heritage while building a valuable collection.

Whether starting a collection, investing in numismatic assets, or seeking gifts for enthusiasts, rare 20 cent coins are essential for serious Australian coin collectors.

Australia’s rare 20 cent coins occupy a special niche in numismatics, bridging everyday currency history and specialist collecting circles. Whether you hold a 1966 trial strike or a vividly off‑centre error, understanding what makes these coins scarce—and how to verify authenticity and condition—is vital. As market demand grows among both local and international collectors, these coins will continue to appreciate, rewarding careful research, grading and stewardship. Start your journey today by examining your pocket change or exploring auction catalogues—you may already own a small piece of Australian monetary history.

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