A. Lange & Söhne L043.6

Second generation Zeitwerk movement with doubled power reserve. Patented barrel design with two mainsprings provides 72 hours of energy for 4,320 minute jumps. Features separate hour correction pusher at 4 o'clock with patented vertical clutch. 451 parts with hand-engraved balance and escape-wheel cocks, solarised winding wheels, and straight-grained remontoir bridge with recessed screwed gold chatons. Balance oscillates at 18,000 semi-oscillations per hour with in-house manufactured balance spring.