A Lange & Sohne 140.025 Zeltwerk Mens Watch. Features a handwound movement with jumping numerical displays for the hours and minutes. There is a power reserve indicator, and small seconds. A constant force escapement ensures precise switching of both jumping displays. The Zeitwerk watch features a convex sapphire crystal over the dial, and a sapphire crystal exhibition caseback to allow viewing of the hand-finished Lange movement.