A. Lange & Söhne 1815 Rattrapante Perpetual Calendar Case: Rosegold case 750/1000 with Sapphire caseback, Alligatorstrap with original clasp;Dial: Solid silver dial with arabic numerals, "chemin de fer" minuterie, 30 minute counter and power reserve at 12 o'clock, month and leap year indicator at 3 o'clock, moonphase indication and small seconds at 6 o'clock, date and weekday indications at 9 o'clock, signed: A. Lange und Söhne ;Movement: German silver manually wound movement with Glashütter stripes, blued screws, column wheel chronograph, finely engraved balance cock and intermediate bridge, Breguet hairspring, Rattrapante column wheel chronograph, perpetual calendar, power reserve ;Accessories: Box and Papers ; Starting bid : 50000