Bidspirit auction | Soviet Union - Stamps and

Soviet Union - Stamps and Postal History - 1927-28, the second definitive issue, 1k, 4k, 7k, 50k and 80k, five blocks of four with invalidating perforation across the design due to various printing or perforation errors, full OG, NH, VF and scarce unit, Est. $300-$350 , Scott #382/400