French gold open face cylinder pocket watch Circa 1820

Very flat edition interesting collector’s watch
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A French Lady’s 18 carat pink gold, very flat edition, circa 1820.
Rare caliber, engine turned case with subsidiaries seconds, engine turned dial.
A very flat cylinder movement, escapement below the dial, digital and jumping hours, decentralized minutes.
Corresponding and probably original key, old watch box, good condition, technical interesting collector’s watch.
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Diameter: 42 mm
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Weight: 45 g
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Signed: No name