Bidspirit auction | Soviet Union - Commemorative Issues

Soviet Union - Commemorative Issues of 1933-35 - 1933, Order of the Red Banner, perforated (9 1/2) proof of 20k in black, red and yellow (issued colors), excellent quality item, full original uneven gum as always exists, NH, VF and undoubted a conditional rarity, Dr. E. Diena certificate, C.v.$8,000, Est. $4,000-$5,000, Scott #518