Cyrillic notation: СОПпр-2а-2-010
[h2]One handed stop watch[/h2]
The stopwatch features a mechanical, single-hand, hand control single-acting and interrupted movement. The stopwatch is designed for measuring time intervals in minutes, seconds and fractions of a second. The stopwatch is used at sports competitions, researches and timekeeping.
The stopwatch has a 60-second dial with 0.2 s division value and 30-minute recorder of 1 min division value.
The 42 mm calibre, 15 ruby jewel movement is provided with spring actuator, lever escapement and balance-hairspring oscillatory system with a cycle of 0,4 s. Special single-acting lever device facilitates the stopwatch hand control. The stopwatch is started, stopped and its hands are reset to zero by successive pushing the winder.
The stopwatch run after a complete winding of the mainspring is at least 18 h.
The dial is coated with white enamel, figures and hands, with black enamel.