A pink gold chronograph wristwatch with calendar, registers, tachometer and moon phases, Universal Genève, 'Tri-Compax', circa 1945

18k, gilt lever movement, mono-metallic compensation balance, champagne matte dial, applied disc numerals, apertures for day and month, three subsidiary dials indicating constant seconds, 30 minute and 12 hour registers and date combined with phases of the moon, outer ring calibrated for tachometer, case, dial and movement signed.