Bidspirit auction | Soviet Union stamps of 1923-32

Soviet Union stamps of 1923-32 - 1927, Aleksandr Popov, Radio Pioneer, red surcharge 8k on 7k blue, horizontal pair, right stamp with inverted ''8'' of surcharge, full OG, NH (error stamp) or LH, VF, C.v. $180++ , Sc. #353, a