«10 Yellow», an early-model Mil’ Mi-4M ASW helicopter with a Koors-M radar of the 830th Helicopter Regiment
Mil’ Mi-4P CCCP-19121 passenger helicopter
Mil’ Mi-4SP «28 Yellow» SAR helicopter with high-viz colour scheme. 830th Independent Helicopter Regiment, Severomorsk, 1960s
«18 Yellow», a late Mil Mi-4M ASW helicopter with a Rubin-V radar.
The type was operated by the 830th Independent Helicopter Regiment in 1954-72
Mil’ Mi-4 CCCP-H963. 3rd Soviet Continental Antarctic Expedition (Nov 1957 — Jan 1959). The unequal size of the registration digits is noteworthy