French silver form watch so called “Star of David” Circa 1820

Silver verge form watch
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A rare silver/enamel form watch so called “Star of David”, circa 1820. A silver case, face enameled, back splendidly engraved, verge escapement, enamel dial, replaced and blued steel hands, corresponding antique silver key, movement intact, French verge movement from the 18th century, signed Ageron.
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Diameter: 70 mm
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Signed:  Ageron  Paris