Bidspirit auction | RSFSR Issues 1918-23

RSFSR Issues 1918-23 - 1922, 5th Anniversary of the October Revolution, 10r brown and black, printed on thinned (0.055-0.06mm) paper, bottom left corner sheet margin block of four, full OG, NH, VF, a common block with paper 0.075-0.08mm is enclosed for comparison, Raritan Stamps opinion, Sc. #212a