The SOSpr-2B-2-000 model is a mechanical two-button stopwatch of the 2d accuracy class. It is designed to measure time intervals in minutes, seconds and fractions of a second. It is equipped with a 60-second sweep with the resolution of 0.2 s and a 60-minute register with the resolution of 1 min.
The movement is powered by a mainspring, has 16 ruby jewels, an anchor escapement, a balance spring and a period of oscillation of 0.4 s. The stopwatch is equipped with a cumulative timing system. To start and stop the stopwatch, press the crown. To reset it, press the button.