Swiss stainless steel open faced pocket watch Circa 1920

Stainless steal  keyless lever
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A Swiss stainless steel open faced keyless pocket watch by Vacheron Constantin, Geneva, circa 1920. A polished caseback, white enamel dial with suspended Arabic numerals, subsidiary seconds at 6 and yellow gold Spade hands. A rhodium plated movement, movement in a later working case, going barrel, gold screwed chatons, straight line lever escapement, cut bimetallic compensated balance with gold poising screws and blued steel hairspring with terminal curve, polished steel index regulator with swanneck spring and micrometric screw, eight adjustments. Signature on the dial and movement.
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Diameter: 50 mm
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Signed: Vacheron Constantin  Geneva
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Accompanied by a contemporary fitted box.
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The dial is slightly oxidized.