Rare Swiss gold and enamel centre seconds verge Circa 1800

Two colour gold and enamel open faced verge with centre seconds
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A rare Swiss two colour gold and enamel open faced centre seconds verge watch, circa 1800. Gilt verge movement. White enamel dial with Roman numerals. Case with translucent dark blue enamel over engine turned ground with gold braided vines to the back, the bezels with two colour gold raised floral vine decoration.
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Diameter: 59 mm
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Signed: No name