Bidspirit auction | Soviet Union - Surcharge 8k

Soviet Union - Surcharge 8k on Postage Due Stamps - 1927, inverted surcharge (type II) 8k on 1k red, typo printing on paper without watermark, nice and fresh, full OG, NH, VF, this stamp exists only with inverted surcharge, Soviet Philatelic guarantees, P. Buchsbayew certificate, Est. $350-$450, Scott #359 var