Swiss silver keyless lever chronometer with power reserve Circa 1940

Silver deck chronometer
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A very fine, rare and large Swiss silver open faced keyless lever deck and pocket chronometer with power reserve, circa 1940. Rhodium-plated movement, Geneva Striping decoration, 18 jewels, straight-line lever escapement, cut bimetallic anibal-brass Guillaume balance, blued steel Breguet balance spring, swan-neck micrometre regulator. Hinged silver cuvette. Matte silver dial with black champlevé Arabic hours, outer minute divisions, up-and-down indication below 12 o’clock, large subsidiary seconds at 6 and blued steel spade hands. The polished case with on the back an engraved monogram within a wreath. Dial signed, case and movement signed and numbered.
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Diameter: 60 mm
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Signed: Vacheron & Constantin Genève
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This timepiece is from a series of 150 lever chronometers made by Vacheron Constantin for navigational use in the 1940s.