Molinja 129YC 55M 24 hour clock, updated 15.08.2021 - Helicopters, pocket watches, flight simulation, tools.

web sources:

I find this clock very interesting as it has a 19 pin connector on the back for several switch functions and internal heating.

Sources: DGC Jahresschrift Band 57, "Russische Uhren für Flugzeuge" Johannes Altmeppen

z.B. in Tu155, IFF Identification Friend Foe.

from Tscheljabinsk, movement 129 ЧС is based on the 122 ЧС