Heavy English gold watch with duplex escapement Circa 1811

Gold duplex pocket watch by Justin Vulliamy
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A heavy English 18K gold open faced duplex pocket watch, circa 1811. Engine-turned à goutte case with an engraved escutcheon on the back, case maker’s punch mark FC FHB, and a movement protection cap. White enamel dial with radial Roman hours and Arabic five-minutes, blued pierced heart-shaped hour hand and a blued Breguet minute hand. Signed, gilt full plate movement with applied floral engraved and pierced appliques, chain and fusee, moulded pillars, duplex escapement, plain three-arm steel balance, temperature-compensating balance spring, rich florally engraved balance cock with a mascaron, silver regulator disc and chatoned diamond endstone on balance.
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Diameter: 58 mm
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Weight: 172 g
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Signed: Vulliamy London
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Justin Vulliamy was a renowned Swiss-born watchmaker who lived in London. In 1730, he went into partnership with Benjamin Gray, who was a watchmaker for King George II. Justin married Gray’s daughter Mary and worked with him in his manufactory in Pall Mall, London. After Gray’s death in 1764, Justin took over the family business and primarily made precision pendulum clocks. His son Benjamin Vulliamy also became a watchmaker and took over the technical management of Vulliamy & Sons from 1775.