Swiss 18 carat yellow gold Art Deco keyless chronometer Circa 1937

Gold open faced lever by IWC
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A Swiss 18 carat yellow gold Art Deco keyless chronometer made by International Watch Co., Schaffhausen, circa 1937. An engine turned case back, the case is made by Wyss & Cie, Bienne / Biel. A silver dial with suspended Arabic numerals, radial indexes, subsidiary seconds at 6 and yellow gold steel hands. A rhodium plated movement, going barrel,  straight line lever escapement, cut bimetallic compensated balance with gold poising screws and blued steel hairspring with terminal curve, polished steel index regulator with swanneck spring and micrometric screw. The dial, case and movement are signed.
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Diameter: 47 mm
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Weight: 53 g
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Signed: International Watch Co., Schaffhausen