There isn't one single "rarest" coin, as rarity depends on factors like mintage, condition, and uniqueness (only one known), but top contenders include the unique 1822 Half Eagle gold coin (only 3 known) or the 1933 Double Eagle, alongside extremely rare pattern coins like the Edward VIII proofs, while historical treasures like the 1794 Flowing Hair Dollar and the Brasher Doubloon are among the most valuable due to extreme scarcity and historical significance, with single examples fetching millions.
The 1822 Half Eagle gold coin is currently one of the rarest coins in existence. Released with a $5 denomination by the U.S. Mint, the eagle design was created by John Reich. Approximately 17,800 pieces of the 1822 coin were made, yet only three are still believed to exist today.
An Australian 2000 $1 "Mule" coin, created by mistake using the smaller 10-cent coin's head (obverse) die, can be worth up to $3,000 due to its distinct double rim and off-center appearance, but its value depends heavily on its condition, with only a few thousand believed to exist.
The Most Valuable & Rare Australian Coins Out Of Circulation (Antique)
The 1959-D wheat penny is one of the most controversial mule coins ever. It's worth $50,000! Here's everything you could possibly want to know about the 1959-D penny error!
Coins worth over $1 million are typically extremely rare historical U.S. gold and silver coins (like the 1933 Double Eagle or 1794 Flowing Hair Dollar) or modern ultra-rare novelties (like the 100kg Canadian Gold Maple Leaf) with few known examples, often due to minting errors, historical significance, or extreme scarcity, with sales reaching tens of millions.
An extremely rare 1988 coin could be worth nearly $15,000 due to an error by the Royal Australian Mint. The coins commemorate the 200th anniversary of the arrival of the First Fleet. However, instead of replacing the standard coat of arms with this design, some coins feature both designs.
Rare Australian $1 coins often have manufacturing errors, low mintages, or unique commemorative designs, with top examples including the 2000 Mule (heavy rim), the 2001 Centenary of Federation (rotated die), low-mintage 2015-2018 ANZAC coins, or error coins like the 1984 struck on a 10c blank (silver), all potentially worth significantly more than face value due to scarcity and collector demand.
Here are 10 rare coins, including five still in circulation, that are certain to increase in value in the next five years.
Other rare 50 cent coins to look for include those from 1985 and 1993, which were other low mintage years. In 1985, only one million 50 cent coins were produced by the Mint making them worth between $15 and $40 each. In 1993, there were also only one million 50 cent coins made.
The rare Australian coin that sells for around $60,000 (or more, depending on condition) is the 1930 Australian Penny, an accidentally minted coin from the Great Depression era with a very low mintage, making it a "numismatic superstar" sought by collectors for its rarity and historical significance. Its value comes from being the lowest mintage pre-decimal Australian coin, with only about 1,500 believed to exist in circulation, notes 9News.com.au and Network Ten.
Incredible, but true: In 2007, the Royal Canadian Mint produced the world's first million dollar coin. The 100 kg, 99.999% pure gold bullion coin with a $1 million face value was originally conceived as a unique showpiece.
The three-dollar piece was a gold coin produced by the United States Bureau of the Mint from 1854 to 1889. Authorized by the Act of February 21, 1853, the coin was designed by Mint Chief Engraver James B. Longacre.
The tiyin was also the name of a subunit of the Kazakhstani tenge until 1995. The Uzbek tiyin is the world's lowest value coin that was still legal tender until 1 March 2020, although in practice it was rarely found in circulation. As of 2024, it takes 1,000 of them to equal just one penny in the United States.
1894-S Barber Dime
In auction, these iconic coins have sold for $1 million to $2 million. This dime's intricate design, featuring Liberty crowned with a Phrygian cap, doesn't seem that different to other Barber coins.
This is a 1933 Double Eagle. It looks like an ordinary twenty-dollar gold coin. But this innocent-looking piece of metal just sold for NINETEEN MILLION DOLLARS.
Decimal Coins with Errors and Low Mintage
Many gamblers in the U.S. swear by the luck of the leap year Mercury dime. The “silver dime” as it's also known, is used in the African-American religion of hoodoo to help conjure luck as well. These practices likely stem from Mercury being the god of “the crossroads” or fate, as well as chance.
Take the 1910-S Lincoln Cent, for instance. At first glance, it's just a tiny copper coin — the humble one-cent piece many of us toss into jars or piggy banks. But among coin collectors, this early Wheat Penny is considered a true gem, commanding prices as high as $250,000 in pristine condition.
The Australian 2020 Firefighter $2 coin with the rare "bullseye error," where the flame design is mistakenly printed over the Queen's face instead of between the firefighters, can be worth up to $6,000 in mint condition, with an uncirculated example selling for nearly that amount. While other error coins exist, this specific minting mistake makes the Firefighter coin a highly sought-after treasure for collectors.
9 of the most valuable coins in the world
To find a rare, valuable 20c coin (worth up to $4000), you need to meticulously search through your change for the 1966 Wavy Baseline 20c coin, identifiable by a curved or wavy line on the bottom of the number '2', rather than a straight one, which indicates a rare minting error from early Australian decimal coins. You can also look for other specific errors like a pointy 'A' in 'Australia' on some dates, but the wavy 1966 error is the key to that high value, so check the date and inspect the number '2' closely.
A 1980 Australian $200 Koala gold coin is worth significantly more than its face value, primarily based on its gold content (10g of 22ct gold) and current gold price, but also with some numismatic value, often trading in the range of AU$1,500 to over AU$2,000 depending on the market, condition (proof vs. uncirculated), and dealer, as it contains about 0.295 troy ounces of pure gold.
In Australia in 1977, the Royal Australian Mint produced a special circulating commemorative 50 cents coin to celebrate the 25th anniversary of the accession of Queen Elizabeth II. This silver jubilee issue was intended to be the only design for the 1977-dated 50 cents coins produced that year.