Rare Swiss silver deck and pocket lever chronometer Circa 1940

Silver open faced lever deck watch
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A very fine Swiss, rare and large, silver, keyless deck and pocket chronometer with power reserve indicator, circa 1940. Up and down deck chronometer, polished, hinged silver cuvette. Matte silver dial with painted Arabic numerals, up and down indication at 12 o’clock, subsidiary seconds dial. Blued steel spade hands. A gilt movement, Geneva striping decoration, 18 jewels, straight line lever escapement, cut bi metallic Anibal brass Guillaume balance, blued steel Breguet balance spring, swan neck micrometer regulator. Dial, case and movement signed.
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Diameter: 60 mm
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Signed: Vacheron & Constantin  Genève
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The movement is oxidized.