A stainless steel triple calendar chronograph wristwatch with registers, LeCoultre 1950s

nickel lever movement, 17 jewels, mono-metallic balance, silvered dial, luminescent Arabic and baton numerals, luminescent hands, subsidiary dials for constant seconds, 30-minute and 12-hour register, apertures for day and month, outer date ring, circular case with down-turned lugs, case, dial and movement signed.