The 20p piece is a rare “mule” coin dating from 2008, and fetched £90 at auction. The coin was minted without a date due to an error and quickly became a sought-after collector’s items.

Here are the five most valuable versions: 2000-P Sacagawea Dollar and statehood quarter mule ($144,000): In coin terminology, a “mule” refers to two different designs on a single piece.

There used to be a saying — “pennies make dimes and dimes make dollars” — that stressed the importance of saving your money (the phrase later showed up in a country song). Today, some ...

Alex Natoli from Coinxchange said you could sell an uncirculated 2000 $1 mule coin for as much as $4,990 as they're fairly "elusive". But he goes through plenty of rolls of $1 coins and is yet to find ...

We are all being encouraged to check our change after a rare 20p coin sold for 485 times its face value this week. The 20p piece is a “mule” coin dating from 2008 and was minted without a date ...

A tiny and " unremarkable" error on your 20p coin makes it worth 485 TIMES its face value. One mistake made for the first time in 300 years caused 250,000 "mule ...