18k white gold case with a black alligator leather strap. Fixed bezel. Grey dial with silver-toned hands and index hour markers. Tachymeter scale appears around the outer rim. Dial Type: Analog. Perpetual calendar. Chronograph - sub-dials displaying: four- 60 seconds( day), month(30 minutes) leap year, power reserve sub-dial. A. Lange & Sohne Calibre L952.1 hand wind movement with about 36 hours of power reserve. Scratch resistant sapphire crystal. Case size: 41 mm. Case thickness: 13.5 mm. Round case shape. Functions: perpetual calendar, moon phase, chronograph, column wheel, flyback, leap year, month, big date, day, GMT, second time zone, hour, minute, small second. Luxury watch style. Watch label: Made in Germany. A. Lange and Sohne Datograph Perpetual Grey Dial 18K White Gold Mens Watch 410.038.