
The A. Lange & Söhne Datograph Perpetual Tourbillon (ref. 740.056FE) is a manual chronograph watch, with a 41.5mm 18kt white gold case, 14.6mm thick, powered by the L952.2 movement and a 50-hour power reserve. Water resistance is rated to 30m, under a sapphire crystal, with perpetual calendar, chronograph, tourbillon, moonphase complications.