|Size||- Diameter: 39.0 millimeters |
- Height: 8.7 millimeters
|Case & Bezel||Up / Down|
|Dial||- Hours and minutes; |
- subsidiary seconds dial with stop seconds;
- UP/DOWN power-reserve indicator, 72 hours power reserve
The name of the 1815 UP/DOWN refers to the birth year of Ferdinand A. Lange and to the brand’s iconic UP/DOWN power-reserve indicator, a device first used in historic pocket watches and marine chronometers. It dates back to a Lange patent granted in 1879.