Cal. 9431 MC nickel-finished lever movement engraved with the Cartier logo 26 jewels the rotor engraved with the Cartier logo and 18K white gold rim the engine-turned silver dial with Roman numerals secret signature at X blued steel moon-style hands four subsidiary dials indicating month combined with leap year display day date and 24 hour dial for the second time zone in large tonneau-shaped case with glazed display back secured by eight screws sapphire-set crown 18K white gold Cartier deployant clasp case dial and movement signed