Swiss gold musical repeater for the Chinese market Circa 1820

Gold half pearl studded pocket watch with musical movement
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A gentleman’s important half pearl studded gold enamel quarter repeating pocket watch with musical movement, for the Chinese market, circa 1820.
18k rose gold case, back with polychrome enamelling; oval medallion in a Champlevé enamel border, rim with engine turned pattern and translucent red enamelling: a mother sewing and keeping watch over a baby in a cot. Case band, pendant and bow with Champlevé ornamentation; half pearl studded bezels, pendant and bow; on/off lever for the strike “N/S”. Enamel dial, radial Roman numerals, blued lozenge hands. Bridge movement, keywind, frosted, gilt, 2 hammers, 2 gongs, 2 going barrels, cylinder escapement, three arm ring balance, musical movement with pinned disc and tuned vibrating blades, mirror- polished, bevelled lever for musical movement.
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Diameter: 58 mm
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Weight: 137 g
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Signed: Piguet & Meylan à Brassus