Thin Swiss platium open faced lever dress watch Circa 1925

Platinum keyless lever watch 
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A very fine and thin Swiss platinum open faced keyless lever dress watch made in the 1920s. Rhodium-plated movement, oeil-de-perdrix decoration, 19 jewels, a straight-line lever escapement, cut bimetallic compensation balance adjusted to eight positions and blued steel flat balance spring. Matte silver dial with applied white gold Arabic numerals, outer minute divisions, guilloché subsidiary seconds at 6 o’clock and original white gold Breguet hands. A solid, polished and brushed case, hinged back. Dial and movement signed, case numbered.
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Diameter: 41 mm
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Thickness: 7 mm
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Signed: Touchon & Co Swiss