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Most people handle coins every day without giving them a second thought. But behind every coin there is a story far stranger and more interesting than its face value suggests. Coins have been used to pay soldiers, fund wars, signal divine authority, and serve as secret gambling currency inside prison camps.
Here are 20 genuinely surprising facts about coins that most people have never heard.
Ancient Origins and Early Coins
1. The oldest known coins are around 2,600 years old
The earliest coins appeared in the ancient kingdom of Lydia, located in what is now modern-day Turkey, around 600 BC. These electrum coins made from a naturally occurring alloy of gold and silver were stamped with simple designs to guarantee their weight and authenticity. The idea spread rapidly across Greece, Persia, and beyond, changing commerce forever.
2. Ancient Greek city-states used turtles on coins
Some ancient Greek city-states, particularly the island of Aegina, featured turtle designs on their coins. The turtle symbolised naval power and trade wealth. Aegina was a major maritime trading hub, and the turtle coin became one of the most recognised currencies in the ancient Mediterranean world. An example of a modern collectible inspired by this tradition is the Ancient Greek Turtle Coin in our ancient coins range.
3. Ancient China used knife and spade-shaped coins before round ones
Before round coins became standard, ancient China used coins shaped like miniature knives and spades. The shapes were gradually simplified and eventually became the round coins with square holes that most people associate with ancient Chinese currency.
4. Roman soldiers were sometimes paid in salt and that is where salary comes from
The word salary derives from the Latin salarium, linked to salt. Roman soldiers were sometimes given salt allowances as part of their pay because salt was a valuable and essential commodity. Many early Roman coins also featured emperors claiming divine power, making coins one of the most effective propaganda tools available to ancient rulers.
5. Pieces of eight were literally cut into pieces
The famous pieces of eight used by pirates and traders in the 16th and 17th centuries were Spanish silver dollars that could literally be cut into eight smaller wedge-shaped pieces to make change. The practice gave us the phrase two bits for a quarter dollar. You can own a collectible inspired by this history with the Spanish 8 Reales 1731 Piece of Eight Coin in our historical world coins range.
Design, Security and Anti-Counterfeiting
6. The grooves on coin edges exist to stop thieves
The tiny ridges around the edge of many modern coins are called reeding. They were introduced centuries ago to stop people shaving precious metal from the edges of gold and silver coins, a practice called clipping. Reeding made clipping immediately obvious.
7. Medieval coin clippers were a serious criminal problem
Clipping was a widespread criminal enterprise in medieval Europe. Some coins lost a significant percentage of their original weight through clipping before being withdrawn from circulation. In England, clipping was considered a form of treason and was punishable by death.
8. Some counterfeit ancient coins are now collectible antiques themselves
Fake ancient coins have been produced for centuries, some dating back to the Renaissance. Many of these early fakes are now so old that they have become collectible historical objects in their own right, studied as examples of period craftsmanship and the history of forgery.
9. Modern mints hide microscopic engravings on coins
Several modern mints include microscopic security features so small they require magnification to see. These hidden details are one of the reasons modern coin production is extraordinarily difficult to replicate without specialist minting equipment.
Wartime, Mistakes and Rare Coins
10. WWII pennies were made from steel
During World War II, copper was needed for ammunition and military equipment. Several countries including the United States temporarily switched penny production to steel, giving 1943 US pennies a distinctive silver appearance. Steel pennies were unpopular because they rusted and were sometimes confused with dimes.
11. A handful of 1943 copper pennies were made by mistake and are worth a fortune
When the US Mint switched to steel pennies in 1943, a small number of copper planchets from 1942 were accidentally left in the presses and struck as copper pennies. These error coins are among the most valuable pennies ever sold, with genuine examples fetching hundreds of thousands of dollars at auction.
12. The rarest circulating British coin is the 1933 penny
The 1933 British penny is one of the rarest coins in existence. Almost none were officially released into circulation. Only a handful were struck for ceremonial purposes including being placed under the foundation stones of new buildings. Fewer than ten are known to exist.
13. Prisoners of war made secret coins for gambling
Throughout history, prisoners of war and inmates have secretly created handmade coins and tokens to use as hidden gambling currency inside camps and prisons. These improvised coins are now collected as unusual historical artefacts that tell a very human story about ingenuity under constraint.
Unusual and Modern Collectible Coins
14. The largest gold coin ever made weighs one tonne
The Australian Kangaroo One Tonne Gold Coin, produced by The Perth Mint, is the largest gold coin ever made. It weighs over 1,000 kilograms and contains roughly a tonne of pure gold. At over a metre in diameter it holds a Guinness World Record and is valued at tens of millions of dollars.
15. Canada made a glow-in-the-dark dinosaur coin
The Royal Canadian Mint has produced some of the most technically innovative coins in the world, including a glow-in-the-dark coin featuring a dinosaur fossil skeleton that illuminates under UV light. It is part of a broader trend of modern collectible coins pushing the boundaries of what a coin can be.
16. Mongolia released a shark-shaped coin with holographic effects
Mongolia has become known for producing some of the world's most unusual collectible coins, including a coin shaped like a shark complete with real holographic effects. These novelty coins are legal tender in Mongolia but are produced almost entirely for the international collector market.
17. Modern collectible coins contain meteorites, dinosaur bones, and shipwreck fragments
Some of the most extraordinary modern collectible coins contain genuine inclusions of rare materials including fragments of meteorites, pieces of dinosaur bone, mammoth ivory, and wood or metal recovered from famous historical shipwrecks. An example of a modern themed collectible coin can be seen in our Novelty Coins Collection.
18. In Yap, stone discs the size of cars were used as currency
On the island of Yap in Micronesia, giant limestone discs called Rai stones were used as currency. Some were over three metres in diameter and weighed several tonnes, far too large to move. Ownership changed through verbal agreement and community consensus. Economists still study Rai stones as a fascinating example of how value and trust function independently of physical exchange.
Language, Culture and Coin Lore
19. Heads or tails comes from ancient coin design
The phrase heads or tails exists because ancient coins typically featured a ruler or important figure on one side and a symbolic animal, shield, or emblem on the other. The convention has persisted for millennia, even as the specific imagery has changed. Today's coin tosses use the same language as those made in ancient Rome.
20. Hobo nickels are hand-carved coins from the Great Depression
During the Great Depression, itinerant workers in the United States began carving US Buffalo nickels into miniature artworks, transforming the Native American profile into elaborate portraits, skulls, and scenes. These hobo nickels became a recognised folk art form and are now collected seriously, with rare examples by known carvers selling for significant sums. The tradition continues today among a small community of contemporary carvers. Browse our Hobo Nickel Coins Collection for modern collectibles inspired by this tradition.
Frequently Asked Questions
What is the oldest coin in the world?
The oldest known coins date to around 600 BC and were produced in the ancient kingdom of Lydia in what is now Turkey. These early coins were made from electrum, a naturally occurring alloy of gold and silver, and were stamped with simple designs to certify their weight and value.
Why do coins have ridged edges?
The ridges on coin edges, called reeding, were introduced to prevent clipping, the practice of shaving precious metal from coin edges. Reeding made it immediately obvious if a coin had been tampered with. The feature was introduced in the 17th century and remains standard on many coins today.
What makes a coin rare and valuable?
Coin rarity and value are determined by mintage numbers, survival rate, historical significance, and collector demand. Error coins like the 1943 copper penny are particularly valuable because they exist in tiny numbers and represent a unique moment in minting history.
Are novelty and collectible coins legal tender?
Many modern collectible coins are issued as legal tender by their issuing country but are produced almost entirely for the collector market. Commemorative collectible coins like those in the One More Coin range are not issued by government mints and are not legal tender. They are designed for display, collecting, and gifting.
How do I start collecting coins?
The easiest way to start is to pick a theme that genuinely interests you and build from there. Themed collectible coins are a great entry point because they are accessible, affordable, and visually striking. Our full guide on how to start a coin collection from scratch walks you through everything you need to know. You can also explore our guide to the best lucky coins in 2026 to see what is popular with collectors right now.
Collectors often find that learning the history behind coins makes the objects themselves more meaningful. You can browse themed designs that bring these stories to life in our Novelty Coins Collection.
All One More Coin products are commemorative collectibles and are not legal tender, not issued by a government mint, and not investment products. They are intended for hobby collecting, gifting, and display purposes only.
Because every collection deserves one more coin.
