This frame used to have a VIP cabin (see photo 1007668). Afterwards it was refitted with a regular updated cabin. Inner window panes are oval, but outer windows stayed circular as manufactured.
Sweden Air Force visit to Kubinka airbase in 1972 -- at the height of Cold War. Host unit was 234 giap which flew MiG-21FL at the time. In MiG's cockpit seats Flygvapnet Chef Gen-Lt Stig Norén while Gen.-Col Jefimov (double HSU and famous WWII pilot) makes a notes
