Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 1135:
1918, black overprint (type 37) on imperforate 50k lilac and green, full OG, NH (!), VF and extremely rare, expertized by J. Bulat, this stamp is listed only in Ukrainian Specialized Cat. (M. Kramarenko) #37.5.37, priced with ”-”, Est. $300-$350
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