Swiss watch with centre seconds for Chinese Market Circa 1880

Silver open faced pocket watch attributed to J. Ullmann & Co. Hong Kong
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A Swiss rare silver enamel pocket watch with centre seconds, studded with half-pearls for the Chinese Market, circa 1880.
Silver case on the back cover with a portrait of a lady in period costume against an engine-turned and translucent cobalt blue enamelled ground, the bezels set with half pearls and glazed movement; white enamel dial , inlaid paillon decor with  Roman hours, Arabic minutes and centre seconds; bridge movement, keywind, lavishly hand-engraved, standing barrel, side lever escapement and screw compensation balance.
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Diameter: 56 mm
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Weight: 118 g
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Signed: No name
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The J. Ullmann & Co company was established around 1880 by Jacques Ullmann in Fleurier, with successful branches soon opening in Hong Kong, Shanghai, Tientsin, Paris and Vladivostock. Jacques Ullmann worked with other makers such as Edouard Juvet, John Barwise and Tavannes Watch Co.; in 1918 he purchased the Bovet company.