Big duplex pocket watch with 8-day movement Circa 1840

Big pocket watch with 8-day movement
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Big Swiss pocket watch with 8-day movement and duplex escapement and Chinese signature, circa 1840. Made for the Chinese market, attributed to Piguet & Meylan circa 1840
Original silver case with Chinese signature and punch PM, glazed movement, engraved gilt duplex movement with 8-day power reserve, original enamel dial with black Roman numerals, original blued steel hands, and central seconds hand. Winding through the back.
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Diameter: 64 mm
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Weight: 139 g
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Attributed to Piguet & Meylan