A Penny Worth a Fortune! 🪙 In 1943, the US switched from copper to steel pennies to save copper for WWII. But a few copper pennies were struck by mistake. One of these rare coins sold for $1.7 million in 2010! Sometimes, a minting mistake creates a treasure. #CoinHistory#

Imagine carrying a 20 kg coin in your pocket! In 1644, Sweden minted a copper coin weighing 19.7 kg, worth 10 daler. Since copper was worth much less than silver, such a large amount of copper was needed to give the coin its value! 🪙 #CoinHistory#

Why does 1 oz equal 31.1035 grams? The answer may lie in medieval France, in the trading town of Troyes. Centuries later, the troy ounce remains the global standard for precious metals, from Silver Eagles to Britannias. A medieval tradition in your pocket! #CoinHistory#