Bidspirit auction | Soviet Union Stamps of 1924-40

Soviet Union Stamps of 1924-40 - 1927, Dr. Zamenhof, Creator of Esperanto, 14k bright green and brown, right sheet margin imperforated block of four with beautiful margins at three other sides, excellent quality, full OG, NH, VF and rare multiple, C.v. $5,500 as singles, Est. $4,000-$5,000, Sc. #374c