Unusual Swiss nickel-chrome chronograph dress watch Circa 1930

Nickel-chrome watch with square button
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A fine and unusual Swiss, nickel-chrome keyless dress watch with a square button chronograph and register, circa 1930. A polished case stepped bezel and integrated bow. Matte silver dial with subsidiary dials for the hours and minutes at 12 and the 30-minute register at 6, outer 1/5th seconds scale. Blued steel epée hands. A rhodium-plated movement, Geneva striping decoration, 15 jewels, straight-line lever escapement, monometallic balance, self-compensating flat balance spring, and an index regulator. Dial, case and movement signed.
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Diameter: 43 mm
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Signed: Gallet & Cie  Swiss