Dutch sterling silver miniature desk/pocket watch Circa 1930

Rare keyless enamel desk/pocket watch
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A fine and rare keyless sterling silver and enamel miniature desk/pocket watch, made by Prisma in Asperen, the Netherlands circa 1930. Four body and rectangular case decorated with a blue and orange enamel decoration, hinged and forming a desk clock and case side set with one cabochon sapphire.
Matte silver dial with luminous Arabic numerals and blued steel skeleton hands. Rhodium-plated movement with 15 jewels, straight-line lever escapement, cut bimetallic compensation balance, blued steel flat balance spring and an index regulator.
Dial signed.
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Dimensions: 25 x 30 mm
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Signed: Prisma