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Airmail issue.
510
Industrial worker with a propeller in front of an industrial zone
The airplane is an Ilyushin II-12 "Coach"
Leading Soviet aircraft designer Sergey Vladimirovich Ilyushin was born on in 1894 in Dilyaleva in the Vologda Province, Russia. He died in 1977 in Moscow, Russia.
Poczta Lotnicza = Airmail.
Ilyushin
Sergey Vladimirovich Ilyushin
510 Proof