English gold heavy duplex gentleman’s pocket watch Circa 1816

Gold open faced pocket watch by Justin Vulliamy
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A very fine, English heavy gentleman’s pocket watch with duplex escapement, circa 1816.
18 carat rose gold engine turned case with reeded band, case maker’s punch mark “FH” (Frederick Humbert of London) and movement protection cap. Silver dial with engine turned centre, radial Roman hours, auxiliary seconds and blued heart-shaped hands. Full plate movement, florally engraved and pierced appliques, frosted, gilt and signed, with chain/fusee, solid movement pillars, three-arm steel balance, temperature-compensating balance spring, rich florally engraved balance cock with mascaron and chatoned diamond endstone on balance.
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Diameter: 55 mm
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Weight: 149 g
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Signed: Vulliamy, London
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Justin Vulliamy
Renowned in London as an excellent watchmaker, the Swiss-born Vulliamy went into partnership with Benjamin Gray, watchmaker for King George II, in 1730. After Gray’s death in 1775 Vulliamy continued his business by himself.