Fine English gold watch with ruby cylinder escapement Circa 1780

Gold pocket watch with ruby cylinder escapement
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A fine 22 carat gold pocket watch with English ruby cylinder escapement. Made by Justin Vulliamy, London, Circa 1780.
Three-body, bassine case with the back cover centred with an engraved coat of arms within an oval, engraved repeated circle and star pattern, bezels engraved with stars. Gilt metal dust cover.
White enamel dial with radial Roman numerals, outer minute track. Blued steel spade hands.
Fire-gilded full-plate movement with cylindrical pillars, fusee and chain, English-type ruby cylinder escapement with brass escape wheel, plain steel balance with flat balance spring, finely pierced and engraved single-footed cock and backplate furniture, diamond end stone and a rack and pinion regulator with silvered dial.
Movement signed.
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Diameter: 53 mm
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Signed: Justin Vulliamy, London

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Justin Vulliamy of Swiss origin, Justin Vulliamy settled in London early in the 18^th century, becoming associated with Benjamin Gray, of Pall Mall whose daughter he married and with whom he was in partnership from 1730 to 1775, carrying on the business after Gray’s death. Gray was clockmaker to George II, and the Vulliamy family held the office of clockmaker to the reigning sovereign until the death of Justin’s son Benjamin Lewis Vulliamy in 1854.