Thin Swiss 18K gold keyless lever pocket watch Circa 1943

Gold open faced lever watch by Vacheron & Constantin
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A very fine, rare and thin Swiss 18 carat gold open faced keyless lever pocket watch, circa 1943. Rhodium-plated movement, Geneva striping decoration, 17 jewels, straight-line lever escapement, monometallic balance, blued steel Breguet balance spring, micrometre regulator. Two-tone silver dial with applied gold Arabic numerals and baton indexes on an inclined reserve, concentric minute track, subsidiary seconds dial and original gold baton hands. Solid, polished case, rounded bezel. Dial, case and movement signed, case numbered.
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Diameter: 48 mm
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Thickness: 9 mm
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Signed: Vacheron & Constantin Genève