English pocket watch with cylinder escapement Circa 1820

Silver open faced pocket watch by Thomas Grignion
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An English gentleman’s pocket watch with cylinder escapement, circa 1820.
Silver polished case with engine-turned band, case maker punch mark “ID” and signed protective cap. Enamel dial with radial Roman numerals and spade hands. Full plate movement, keywind, gilt, with chain/fusee, square tapered pillars, cylinder escapement, brass escape wheel, three-arm steel balance, finely florally engraved pierced balance cock with grotesque face and set diamond endstone on balance.
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Diameter: 44 mm
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Weight: 97 g
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Signed: Thomas Grignion, London
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Thomas Grignion (II). London 1790-1825.