Bidspirit auction | Soviet Union Stamps of 1924-40

Soviet Union Stamps of 1924-40 - 1933, Leningrad Philatelic Exhibition, red surcharges 30k on 15k black brown and 70k on 35k ultra, complete set of two, nicely centered and post office fresh, full OG, NH, VF, C.v. $507.50, Est. $300-$400 , Sc. #487-88