A late 18th Century English Duplex in a gilt open face case. Full plate fire gilt movement with gilt dust cover cut away to reveal the table of the pierced and engraved cock with diamond endstone and silver regulator disc. Fusee and chain. Plain three arm steel balance, blue steel spiral hairspring. Duplex escapement with ruby locking roller, gilt escape wheel, pivots with endstones. White enamel dial with subsidiary seconds, Roman numerals, blue steel seconds hand, gold hands. Plain gilt metal open face case, maker's mark “GR” in a rectangle.