Vintage Soviet Helicopter Stamps

These six stamps were issued in 1980 and depict six models of Soviet military and civilian helicopters that were in service at the time.  1 kopek stamp - The Yakovlev Yak-24 was a Soviet twin-engine, tandem rotor, transport helicopter developed by Yakovlev in the 1950s. The Yak-24 saw limited use in the Soviet Air Force, and the exact number produced and duration of service are unknown due to inconsistencies in data. 2 kopek stamp - The Mil Mi-8 is a medium twin-turbine helicopter, originally designed by the Soviet Union, and still produced by Russia. In addition to its role as a transport helicopter, the Mi-8 is also used as an airborne command post, armed gunship, and reconnaissance platform. The Mi-8 is among the world's most-produced helicopters, used by over 50 countries. 3 kopek stamp - Ka-26 - The Kamov Ka-26 was a Soviet light utility helicopter with co-axial rotors. The Ka-26 was used by some Warsaw Pact armies in the light paratroop or airborne role. The fuselage consists of