Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 2
Lot 1030:
1991, 25th Anniversary of the Soviet Philatelic Society, Butterflies and Flowers, 20k+10k multicolored, imperforate souvenir sheet, perfect quality in every respect, full OG, NH, VF and unique, no such sheets were offered to the market, Est. $7,000-$8,000, Scott #B180 imp
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