Watch List notes:

British Medals, George III, Accession 1760, silver medal, unsigned but by Thomas Pingo, draped and armoured bust l., hair tied behind, GEORGIVS TERTIVS REX, rev. Britannia stands before radiant star-burst, lion at her feet, spear topped with Phrygian cap, and other emblems, FELICITAS BRITANNIAE, 41mm., wt. 31.36gms. (BHM.3, R2; Eimer 683; Eimer, Pingo 17), extremely fine and rare
*bt. Spink & Son, c.1980
The closeness of the weight to one ounce, suggests that the medal may have had some sort of official status.
(300-400 GBP)