Very fine Swiss doctors watch with chronograph Circa 1925

Fine beautiful watch with an original certificate
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An extremely rare, very fine Genevan doctors watch with chronograph, 30 min. counterand pulsation scale with original certificate, circa 1925.
18 Carat gold case and white enamel dial. 2/3 plate movement, gold screw compensation balance.
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This single button pocket chronograph in its elegant beauty is well preserved. The watch’s most outstanding feature is the rare pulsation scale on the dial, as documented in the enclosed original certificate from 1929.
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Diameter: 51 mm
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Weight: 87 g
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Signed: Vacheron & Constantin à Genève