Vacheron & Constantin, Genève, No. 395719, case No. 257873. Made in 1918, English import marks for 1939. Fine and rare, 18K yellow gold keyless dress watch with chronograph, instantaneous 30-minute register and outer tachometer scale. Four-body, "bassine", solid, polished, concealed hinge.Hinged gold cuvette. White enamel with black Breguetnumerals, outer tachometer scale calibrated for 1000 metres,30-minute register at 12, subsidiary seconds at 6. Gold "spade"hands.