French rose gold repeating musical cylinder watch Circa 1820

Rose gold musical repeater by Henry Darlot
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A large and heavy French rose gold open faced repeating musical cylinder pocket watch, circa 1820. Two barrels for movement and musical mechanism, cylinder escapement, engraved balance bridge, unusual blued gong, very rare musical movement with vibrating blades on both sides of the disc. White enamel dial with Arabic hours and outer minute divisions, unusual hands in the form of a snake and an arrow. Unusual case form with lobed rim, engine-turned on the back, blanc cartouche. Cuvette signed.
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Diameter: 57 mm
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Weight: 139 g
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Signed: Henry Darlot
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Darlot Paris, 1795. On a clock decimal at Carnavalet. On a Louis XVI period: d’Arlot Horloger du Roy at Versailles.