Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 992:
1991, Endangered Species, 1000r multicolored, reconstructed (top and bottom parts joined together) composite proof sheetlet of six, printed on thick glazed paper, control angles at corners, each stamp with black overprint ”Prueba” (Proof) on reverse, no gum as produced, NH, VF and very rare, reportedly only 45 sets were sold, no complete sheet exists on the market, the only uncut sheet retained in the Mexican Postal Museum, Est. $600-$800
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