A late 18th Century English centre seconds cylinder in silver pair cases. Full plate fire gilt movement with turned pillars, gilt dust cover pierced to reveal the silver index. Pierced and engraved cock with large diamond endstone in a blue steel setting, pierced and engraved foot and plate for the silver regulator disc. Fusee and chain with worm and wheel barrel setup between the plates. Plain three arm steel balance, blue steel spiral hairspring. Polished steel cylinder, large brass escape wheel. Fine white enamel dial with centre seconds, Roman and Arabic numerals, seconds track at the edge. Steel centre seconds hand situated between the gold beetle and poker hands. Purpose made matching silver pair cases hallmarked 1851, lateral steel stop lever.