Swiss silver gilt calendar verge sunrise and sunset Circa 1820

Silver gilt open faced verge with calendar, sunrise and sunset indication
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A Swiss silver gilt open faced verge watch with calendar, sunrise and sunset indication, circa 1820, gilt full plate verge movement, pierced and engraved balance bridge, central engine turned gilt dial with Arabic numerals, outer enamel dial decorated with putti, subsidiary dials for date and month, apertures for moon phases and night and day indication, movement and dial signed.
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Diameter: 59 mm
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Signed: Duchene à Genève