Fifty Pence 2021 50th Anniversary of Decimal Day , struck on 15 February 2021, Gold Proof S.H92 the reverse a clever assemblage combining parts of the designs of the pre-decimal coinage Florin, Shilling, Sixpence, Brass Threepence, Penny, Halfpenny and Farthing. In the centre, a 7-sided panel with '1971 Decimal Day'. FDC in the Royal Mint box of issue with certificate number 222 signed by Gavin Elliott, Head of production of Commemorative coin