A George III silver goblet

A George III silver goblet, apparently unmarked, marks probably lost in decoration, urn shaped bowl, later embossed with a yachting scene on a lake, inscribed 'LONDON MODEL YACHT CLUB, won by KESTREL , T. H. Williams, March 25th 1850', on a raised circular foot, height 15.6cm, approx. weight 6.5oz.