Swiss 18K yellow gold oval Art Deco ring watch Circa 1920

Gold, platinum and diamond-set ring watch
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A fine and unusual Swiss, 18K yellow gold and platinum, diamond-set, keyless, oval Art Deco ring watch, circa 1920. A ring watch with diamond-set bezel and shoulders, the band with a band of engraved foliage. Oval matted silver dial with black painted Arabic numerals and inner minute track. Black steel spade hands. A rhodium-plated movement, 15 jewels, straight-line lever escapement, bimetallic compensation balance, blued steel Breguet balance spring, index regulator. Dial and movement signed and numbered, case numbered.
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Dimensions: 27 x 15 mm
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Signed: Longines  Swiss