You don’t usually see errors with proof coins, but there are exceptions. One involved 1975 dime proof sets, which that lacked an “S” mintmark (from the San Francisco Mint).

The coin expert added: "One of these coins sold in online auctions for £485. However, another silver two-piece sold for £1,350 - 67,000 times its face value. Another went on sale for £485 on eBay.

Brits have been told to look out for a 50p coin that could be worth more than 80 times its face value. This coin, from 2017, has sold in the past for as much as £40. But why is it so valuable? It ...

Manufacturing errors might be annoying when it comes to most products, but they can be a massive moneymaker when it comes to collectible money. Errors increase the value of collectibles because a ...

The coin's release was part of the "50 State Quarters Program," in which the U.S. Mint rolled out state-themed coins between 1999 and 2008. Wisconsin was the 30th state given the treatment (as it ...

Its 27.5mm diameter makes it the largest of any British coin, and allows space for decorative pictures. It has often been used to celebrate big events over the past 50 years of British history.

When the U.S. Mint was experimenting with different types of metals for coins, they were testing out one with a gold tint meant for the Sacagawea dollar coin in 2000.

The coin's release was part of the "50 State Quarters Program," in which the U.S. Mint rolled out state-themed coins between 1999 and 2008. Wisconsin was the 30th state given the treatment (as it ...