Watch List notes:

British Medals, William & Mary, Coronation 1689, silver medal, by Jan Smeltzing, copying Bower's medal, conjoined busts r., he laureate, GVLIELMVS ET MARIA DG BRITANNORVM REX ET REGINA F D, rev. Perseus rescuing Andromeda from a sea-monster, PRETIUMQ ET CAVSA LABORIS, 37.5mm., flan 2.67mm. thick (MI.664/28), mint state or virtually so, with rich steel-grey tone, extreme rarity
*ex Glendining's, 30 March 1983, lot 223 – miscatalogued as a Bower original
MI. notes the medal having die flaws as an explanation of its rarity, however this specimen shows no sign of them.
(600-800 GBP)