Magnificent Swiss white gold tourbillon watch Circa 1945/1990

White gold open faced keyless lever tourbillon by Vacheron & Constantin
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A magnificent and extremely rare Swiss 18 carat white gold open faced keyless lever tourbillon watch, encased in 1990. Les complications collection. Finely engraved 3/4 plate nickel finished jewelled lever movement (manufactured in 1945), three armed one minute tourbillon carriage with Guillaume balance partially visible through a porthole on the silvered engine turned dial with applied Roman numerals and dauphine hands. Large and heavy case, ribbed and milled band, glazed display snap on back. Case, dial and movement signed, case and movement numbered.
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Diameter: 60 mm
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Signed: Vacheron Constantin Geneve