Bidspirit auction | Soviet Union stamps of 1923-32

Soviet Union stamps of 1923-32 - 1927, definitive issue, black surcharge 8k on soldier 7k brown, complete set of three stamps with space between lines of 2mm, full OG, NH, as well as two used stamps with space of 0.7mm, perforation 12x12½ on paper without and with watermark, mostly VF, Sc. #349-50, a, b