Swiss 18K yellow gold open faced lever pocket watch Circa 1925

Gold pocket watch by Vacheron & Constantin
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A fine, Swiss manual wind 18K yellow gold pocket watch with an open face, circa 1925. Gilded brass movement, going barrel, gold screwed-Chaton (setting) on the central wheel, straight-line lever escapement. Enamel dial with suspended Dauphine radial hours, outer minutes track, subsidiary dial for the seconds, and original pear hands. Round-shaped 18K yellow gold polished case. Dial, case and movement signed. Accompanied by a fitted box and extract from the archives.
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Diameter: 52 mm
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Signed: Vacheron & Constantin, Genève
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Given by La Société Genevoise d’ Instruments de Physique à Oscar Weber (1901-1926).
Overhaul recommended.