Fifty Pence, 1992/3 'British Presidency of Europe' Official First Day Coin Cover, Very Clean & Scarce. Notes: on this coin, 'Courtesy of the Royal Mint Blog'. Claiming the 'Rarest Coin Title'. Following our recent revelation about the rarest UK coin in current circulation - the Kew Gardens 50p - we've seen lots of comments about, even rarer 50p. People have been talking about the 1992-3 50p that marked the UK's Presidency of the Council of Ministers and completion of the Single European Market. And they are not wrong, as only 109,000 of that coin were minted. But don't get too excited, because you're never going to find it in your change these days. It was one of the larger, heavier 50p coins that, following a review of the UK currency in 1994, was withdrawn from circulation in 1997.