Soviet Union 1931 50k violet brown, imperforate trial color proof on gummed stamp paper, large margins all around, l.h., fresh and v.f., with Museum handstamp. A significant rarity, only 24 (!) printed, this one being position 15 (indicated in pencil), with 2016 Buchsbayew certificate (Mi.400Fb)
(via Philasearch.com - Soviet Union Airmail stamps, Michel 400Fb, Scott C18var)
http://ift.tt/2pGCo4U
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