1988 UK The 10th Anniversary of Coinex (Coin Show) & The Tercentenary of The Events Leading to The Accession of William & Mary Medal strunk by Royal Mint. Silver: 65MM./155 gm. Proof finish. #118/500 Mintage Obv: An Oval with busts of King William III and Queen Mary II above, English & Dutch sailing ships below. Rev: An adaptation of the "Cartwheel" twopence reverse, Britannia seated with a ship & lighthouse in the background..