A gold automatic triple calendar chronograph wristwatch with moon phases and registers, Theorein circa 2000

18k, gilt lever movement, 25 jewels, mono-metallic balance, gold rotor, white dial, applied baton numerals, outer date ring, engine turned subsidiary dials for 30-minute register combined with apertures for German day and month, 12-hour register combined with phases of the moon and constant seconds combined with 24-hours indication, circular case with finely reeded bezel, glazed display back, dial and movement signed.