1935, Amelia Earhart Flight to Mexico, violet overprint on ''Eagle Man'' 20c lake, right sheet margin plate No.67021 block of four, perfect quality, full OG, NH, VF and rare multiple, that is one of three known plate number blocks of four, only 300 stamps were overprinted, sufficient part of those were used on correspondences, one stamp with K. Lissiuk guarantee hs, MEPSI certificate, C.v. $24,000 as four single stamps (Image)

1940, Centenary of the Penny Black, 5c-5p, postage and air post, complete set of ten, slight gum disturbance on No.C104, full OG, NH, VF, C.v. $340 (Image)

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 (Image)

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 (Image)