It's extraordinarily rare because it makes up just one of two known coins to exist without an S mint mark - to reflect where it was made. The sisters, who chose to be anonymous, told a California ...

These are the 20 most valuable pennies ... One or more damaged die at the Denver Mint resulted in coins struck without a mint ...

A SPECIAL 50p coin that’s the Royal Mint’s rarest has sold for more than 200 times its face value after it sparked an eBay ...