Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 993:
1991, Endangered Species, 1000r multicolored, complete set of six imperforate proofs with control angles at corners, printed on thick glazed paper, cut from composite proof sheetlet of six, each one with black overprint ”Prueba” (Proof) on reverse, no gum as produced, NH, VF and very rare, reportedly only 45 sets were sold, Est. $400-$500
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