Aircraft Clock, Russian/USSR, Submarine, Ship Chronograph 129 ChS 55M PBM-5 Mariner Navigation (Ground Speed) Stopwatch

Navigation (Ground Speed) Stopwatch

Reference numbers for pilot compasses began with "P") to take navigational bearings in situations where a fixed compass could not be used

The cover can be easily removed

The bubbles in the levels are intact and all other mechanical functions appear to operate as intended

Aircraft Clock, Russian/USSR, Submarine, Ship Chronograph 129 ChS 55M PBM-5 Mariner Navigation (Ground Speed) StopwatchFrom our own internet research, the 129 ChS 55M Clocks may have been used in Soviet aircraft (such as Tupolev bombers), ships submarines, and underground missile silos. Manufactured in the 1980 90's. Since the factory seals are intact over screw heads, we have not opened case to examine the movement. It is represented elsewhere on the internet as a fully mechanical (Caliber 66970, 15 Jewels), wind up clock with 3 day running reserve, 2 day launch