Bidspirit auction | Soviet Union - Stamps and

Soviet Union - Stamps and Postal History - 1927, Dr. Zamenhof, Creator of Esperanto, two singles of 14k yellow green and brown, printed on paper with horizontal watermark Borders and Rosettes, first one with plain label at the bottom, the other one with full offset of green color on the back, vertical invalidating perforation, full OG, NH, VF, Est. $500-$600, Scott #373 var