A Rare Gold Single Button Chronograph Wristwatch with Register and Pulsemeter, Ulysse Nardin, Locle & Genève, Circa 1935

18k, nickel lever movement, bimetallic compensation balance, precision regulator, two-tone silvered dial, black Breguet numerals, outer pulsemeter scale, two small engine-turned subsidiary dials indicating constant seconds and 30 minute register, outer pulsations scale, small circular case with raised bezel, downturned lugs, single oval chronograph button in the band, snap on back, case, dial and movement signed.