Fascinating! I had no idea that Cornavin were sourcing complete watches from the USSR as early as when the older 2616 was still in production, and yet the similarity of the case to the slightly later Poljot suggests that they came from the same source.They look like they could be related but the Poljot is a 23 jewel movement and the Cornavin is 30.
Very efficient! A new back and it's good to go with the new movement. It reminds me of vintage Chinese automatics which use the same case as the hand-winding version with the caseback making up the diference. You need a well-padded strap to make such a watch sit comfortably on the wrist.The case is the same for both watches with the exception of the extra hole in the Poljot case for the day change.
The caseback on the Poljot is much deeper, however.
Do you suspect this watch was assembled in HK from Russian parts?Walt Odets' article on Jessica's Cornavin, with Poljot movement, Taiwanese-made dial, HK-made case and assembled in HK, always brings me a chuckle - in a good way.