Elegant Swiss platinum skeletonized keyless watch Circa 1980

Platinum lever dress watch
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An extremely rare and elegant Swiss platinum keyless pocket watch made by Vacheron Constantin SA in Geneva. The skeletonized movement with 20 jewels, a straight line lever escapement, flat balance spring and an index regulator. Skeletonized dial with original 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
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Reference 57100/1.