William Downham, a late George II silver pair-cased pocket watch, no. 6589, hallmarked London 175

William Downham, a late George II silver pair-cased pocket watch, no. 6589, hallmarked London 1758, with a two piece outer case and two piece inner case, the white enamel dial with black Roman numerals and gold hands, the full plate verge fusee movement with square balustered pillars, pierced and engraved balance cock with grotesque mask, pierced and engraved ornaments, blued steel screws, three armed steel balance with tapered arms and undersprung balance spring, the back of the case engraved with a rubbed name, the outer case 49mm diameter, the inner case 40mm