Bidspirit auction | Soviet Union - Definitive Stamps

Soviet Union - Definitive Stamps on Paper w/o Watermark - 1936-37, factory worker 10k dark blue, horizontal imperforated pair with gutter and control line in the middle, slight fold along the gutter as always exists, perfect quality otherwise, full OG, NH, VF and extremely rare, only a few such gutter pairs are recorded, each stamp with J. Stolow hs, Raritan Stamps guarantee, Est. $3,000-$4,000, Scott #616b