|Brand:||A. Lange & Söhne|
|Date:||Date, Day, Leap Year, Month, Perpetual Calendar|
|Chronograph:||Chronograph, Column wheel, Flyback, Rattrapante|
|Additionals:||Chain & Fusée, Tourbillon Escapement|
Caliber L133.1 was introduced at SIHH 2017, continuing a tradition that began with the 1994 launch of the Tourbillon 'Pour le Mérite' and subsequently the 2005 Tourbograph 'Pour le Mérite'. As the most complicated model of the series, it pairs the tourbillon and fusée-and-chain transmission with a rattrapante chronograph with two column wheels and a perpetual calendar. It consists of a total of 684 parts including 52 jewels.