A. Lange&S ö hne 1815 Rattrapante Perpetual Calendar 421.025, men's manual mechanical wristwatch, made of 950 platinum material, with a diameter of 41.9mm. The dial is cast in solid silver, and the hands are made of 18K yellow gold plated with rhodium, blue steel, and 18K steel. The watch features sapphire crystal glass, date, week, month, power reserve display, moon phase, long power, dual tracking timing, perpetual calendar, and combines many complex functions into one complete set.