English 18K gold open faced cylinder watch Circa 1820

Gold watch with unusual pump winding mechanism
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An English 18 carat gold open faced pocket watch, circa 1820. The gilt movement with a cylinder escapement. White enamel dial with Roman hour numerals, an outer minute track and blued hands. A plain case, an unusual pump winding mechanism above the pendant. Case and movement with matching numbers.
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Diameter: 50 mm
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Weight: 66.5 g
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Signed: Vines & Co London