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, the only uncut sheet retained in the Mexican Postal Museum

500.00

1950-52, Guerrero, air post stationery envelope 35c dark violet, stamp is printed twice (one is misplaced), unused, VF and scarce

100.00