Elegant Swiss platinum keyless lever dress watch Circa 1980

Platinum skeletonized pocket watch 
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An extremely rare and elegant Swiss platinum keyless lever pocket watch made by Vacheron Constantin S.A. in Geneva, circa 1980. The skeletonized movement with 20 jewels, a straight line lever escapement, flat balance spring and an index regulator. Skeletonized dial with blued steel hands. The case is glazed on both sides and has a reeded bezel. Movement and case signed and numbered.
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Diameter: 43 mm
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Signed: Vacheron & Constantin Genève