Swiss platinum diamond and sapphire ring watch Circa 1920

Platinum Art Deco lever ring watch
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A fine and very elegant Swiss, platinum, diamond and sapphire-set Art Deco ring watch with concealed winder, circa 1920. An engraved case band with foliage, hinged bezel set with diamonds and sapphires, diamond-set shoulders, the right hand side concealing the winder. Matte silver dial, diamond shaped, black painted Arabic numerals, outer minute track. Blued steel lozenge hands. A rhodium plated movement, 18 jewels, straight line lever escapement, cut bimetallic compensation balance, four adjustments, blued steel Breguet balance spring, index regulator.
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Thickness: 7 mm
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Dimensions: 23 x 13 mm
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Signed: Elem Watch Co.  Swiss
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The dial is slightly spotted.