English 22k gold, agate-mounted pocket watch Circa 1750

Gold open faced verge pair-cased pocket watch
–
A fine and rare English, 22K gold, agate-mounted pair cased pocket watch, circa 1750. Outer case: chased repousse rococo gold, back and bezel set with panels of translucent striated agate over foiled metal. Inner case: bassine, polished, shuttered winding aperture. White enamel dial with radial Roman numerals, outer minute track and outermost Arabic five minute numerals. Blued steel Beetle and Poker hands. A hinged, frosted gilt full-plate movement with square baluster pillars, fusee and chain, verge escapement, brass balance with flat balance spring, pierced and engraved single-footed cock, silver regulation dial. Movement signed.
–
Diameter: 46 mm
–
Signed: Isaac Roberts  London
–
Isaac Roberts (d. 1774) Is recorded as working in London, Compton St., in 1762.