Cal. L922.1 nickel-finished lever movement 43 jewels finely hand-engraved balance bridge swan neck regulator 21K gold micro-rotor with platinum rim solid silver dial applied white gold Roman numerals luminous hands outer railway minute divisions large double window for date three subsidiary dials for week and 24 hour display month and leap year constant seconds and moon phase large circular case calendar change button in the band glazed display back secured by six screws platinum A. Lange & Söhne deployant clasp case dial and movement signed