Cal. 4009 nickel-finished lever movement 31 jewels the engine-turned silver dial with applied Roman numerals on blank chapter ring outer tachymetre scale three windows for day month and date three subsidiary dials indicating constant seconds 30 minutes register and 12 hours register combined with phases of the moon in large circular water-resistant-type case with stepped bezel the glazed back secured by six screws fluted downturned lugs stainless steel Zenith hidden clasp case dial and movement signed