A pink gold chronograph wristwatch with calendar, registers and moon phases, Universal Genève, 'Tri-Compax', circa 1950

18k, nickel lever movement, mono-metallic compensation balance, silvered matte dial, applied baton and square numerals, apertures for day and month, four subsidiary dials indicating constant seconds, 30 minute and 12 hour registers and date combined with phases of the moon, circular case, case, dial and movement signed.