VACHERON & CONSTANTIN POCKET CHRONOGRAPH YELLOW GOLD Vacheron & Constantin, Geneve, movement No. 369721, case No. 228278. Made circa 1915. Very fine and rare, 18K yellow gold, keyless pocket watch with register and pulsometer. Four-body, bassine, polished, button in the crown for the start/stop/return- to-zero functions of the chronograph. Hinged gold cuvette. White enamel with Breguet numerals, outer red pulsometer scale and 1/5th seconds track with 5 second Arabic markers, subsidiary seconds and 30-minute register. Blued steel epee hands. Cal. 43 mm. 23 jewels, straight-line lever escapement, cut bimetallic compensation balance, blued steel Breguet balance spring, swan-neck micrometer regulator. Notes Dial, case, cuvette and movement signed. DIAM. 54mm. THICKNESS 13mm.