Since moving to pounds and pence in 1971, more than 70 variants of the 50p coin have been minted, and the renowned Kew Gardens 50p was recently knocked off the top spot of rarest 50p coins in the UK. This title now belongs to the Atlantic Salmon 50p, with a release mintage of only 200,000—just surpassing the Kew Gardens 50p with its mintage of 210,000. Rarest 50p coins in circulation the UK? The other rarest coins stem predominantly from the 2011 Olympics, with the wrestling, football and judo coins among the most valuable. Top 10 most valuable 50p coins, according to Royal MintHere is a list of the top 10 most valuable coins, when they were made and how many were minted: