French elegant silver open faced verge watch Circa 1820

Silver open faced gentlemen’s watch 
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An elegant French silver open faced key wind pocket watch, circa 1820. The numbered, tiered and polished case has pink gold bezels and a fluted band. The white enamel dial has Arabic hours, an outer minute track, outermost Arabic quarter hour numerals and blued hands. The signed fire gilded full plate movement features a verge escapement, large regulator scale, an engraved and florally pierced balance bridge and a three arm brass balance.
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Diameter: 56 mm
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Weight: 89 g
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Signed: Keißer à Grenoble