Swiss rare 18 carat gold open faced doctor’s watch Circa 1930

Gold Chronógrafo Medical by Ulysse Nardin
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A rare Swiss 18 carat gold open faced doctor’s watch, circa 1930. Comes with the original presentation box, original certificate and an original spare dial with hands.
Plain case. A signed gold dome. Signed white enamel dial with Arabic hours, a pulsation scale, auxiliary seconds, 30 minute counter, central chronograph hands and blued spade hands. Rhodium plated 1/2 plate movement, Geneva striping decoration, the finest matted steel chronograph parts, a ratchet wheel, Swiss Patent 54714, screw compensation balance and index spring fine adjusting device.
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Diameter: 50 mm
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Weight: 85 g
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Signed: Ulysse Nardin Locle & Genève Chronógrafo Medical