Technicians are preparing the Polish MiG-21PFM for takeoff. The canopy is tilted to the right. The MiG-21PFM was the first version of the fighter to feature two rear-view mirrors in the cockpit. Later they were also used on vehicles of the MiG-21SM family. Only on the MiG-21 MF they were replaced with a TS-27LMSh rear view mirror. The MiG-21PFM was also equipped for the first time with the improved RP-21MA Sapphire radar.
Two rear mirrors on the MiG-21PFM canopy. These mirrors were not present on early MiGs. This aircraft is also equipped with a TS-27AMSH rear-view mirror. In addition, this is an early version of the MiG-21PMF, since the aircraft is equipped with a KM-1 ejection seat.
https://military.wikireading.ru/33447?ysclid=lzs4o0c1wx378987657
TS-27AMSh is the rearview periscope common for other aircraft too (MiG-23, Su-25, etc)
View from Il-76