A. Lange & Sohne 1815 Rattrapante Perpetual Calendar Watch, round platinum case (41.9mm diameter x 14.7mm thickness) with transparent case back, black hand-stitched crocodile leather strap with a platinum clasp, silver dial with black Arabic numerals and white gold hands, subsidiary seconds dial with stop seconds, rattrapante chronograph with minute counter, perpetual calendar (date, day-of-week, month, and leap-year), moon-phase display, up and down power-reserve indicator, Caliber L951.5 manual-winding movement with 60 hour power reserve.