The Lange 1 Tourbillon is a luxury watch with tourbillon by A. Lange & Söhne. It is the first wristwatch in the world with the combination of tourbillon, patented big date indicator, double barrel for three days power reserve and progressive power reserve indicator. The watch is driven by the manual winding manufacture movement L961.1 with minutes Tourbillon, hacking seconds, power reserve indicator and big date. The case is optional in platinum or red gold.
Overall the movement combines 378 finely finished components. Their interaction can be observed through the sapphire crystal caseback.