French silver open faced gentlemen’s verge watch Circa 1820

Silver open faced gentlemen’s watch 
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An elegant French silver open faced gentlemen’s pocket watch, circa 1820. The fire gilded key wound full plate movement with a verge escapement, large regulator scale, an engraved and florally pierced balance bridge and a three arm brass balance. The silver polished case is tiered, has rose gold bezels and a fluted band. White enamel dial with Arabic hours, an outer minute track, outermost Arabic quarter hour numerals and fine blued hands. Movement signed, case numbered.
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Diameter: 56 mm
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Weight: 90 g
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Signed: Keißer à Grenoble