Swiss watch with frictional-rest verge escapement Circa 1800

Silver open faced pocket watch
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A very rare Swiss gentleman’s pocket watch with frictional-rest verge escapement according to Flamenville, circa 1800.
Polished silver case. Enamel dial with eccentric hour indication with Roman numerals, centre seconds, and Breguet hands. Full plate movement, frosted, gilt, Flamenville verge escapement, three-arm ring balance.
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Diameter: 57 mm
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Weight: 96 g
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Signed: DLR, Swiss