A world first, this magnificent 45.9mm Lange & Söhne boasts a staggering 31-day power reserve! The hand-made key-wound movement of this solid 18ct rose gold Lange 31, features a superior stacked twin barrel winding system occupying 3/4 of its diameter, visible beneath the sapphire crystal case back. The elegant frosted silver dial has applied rose gold batons, retrograde 31-day power reserve, subsidiary seconds and oversize dual date aperture. Brand new watch and sold complete with special winding keys, box, certificate and instructions. Guaranteed for 2 years.