A George III silver mug

A George III silver mug, by Thomas Wallis, London 1774, baluster form, embossed foliate decoration above part-fluted decoration, scroll handle, later inscribed ' THE MAYER DE ROTHSCHILD MEMORIAL CUP ROYAL BUCKS AGRICULTURAL ASSOCIATION MEETING 1888 PRESENTED BY THE EARL AND COUNTESS OF ROSEBERY TO MR G.A. LEPPER FOR THE BEST YEARLING NAG COLT BY ST.SWITHIN', height 17cm, approx. weight 17oz.