Swiss platinum open faced Art Deco dress watch Circa 1920

Onyx, platinum and diamond set watch
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A rare and fine Swiss onyx, platinum and diamond set keyless Art Deco dress watch made by Haas Neveux & Co in Geneva, circa 1920. The bezel and bow are platinum, the case is onyx and the band is diamond set. A two tone silver dial with black Breguet numerals, outer minute track and blued steel hands. Rhodium plated movement, 17 jewels, a straight line lever escapement, cut bimetallic compensation balance, blued steel flat balance spring and micrometre regulator. Dial signed René Boivin, movement signed by the watchmaker.
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Diameter: 45 mm
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Thickness: 8 mm
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Signed: Haas Neveux & Co