1940 Penny Black Centenary, blocks of four, one stamp l.h. in each, others n.h., v.f., cat. $1161 (Cat No. 754-58,C103-07) (Image)

Cat. $1161, Est.US$250

1935 Amelia Earhart, 20c lake with additional "MUESTRA" (Specimen) overprint, l.h., v.f., with 1970 Philatelic Foundation certificate (Cat No. C74S) (Image)

Est.US$300

1939 SARABIA, registered cover from Mexico City, additionally franked with 20c, both tied by "Servicio Aereo Mexico D.F. 23.May.39" cds, with violet flight cachet, registration pmks and New York arrival on reverse, v.f. (Sanabria 151) (Cat No. C93A) (Image)

Est.US$150

1960 20p carmine & green, upper left sheet corner margin block of four, n.h., v.f., cat. $400 (Cat No. C249) (Image)

Cat. $400, Est.US$200

1936 Hindenburg flight cover from Pachuca to Germany, attractively franked, with Registry and Hindenburg cachets, New York transits and two "Correspondencias Registradas" labels on back, "Mit Luftschiff Hindenburg Befordert" datestamp applied on arrival, v.f. (Si.409T, Euro 1,350) (Image)

Est.US$250

1936 Hindenburg, second return flight cover from Mexico City, via New York to Germany, with registry label, transit and arrival pmks on back, v.f. (Si.411D) (Image)

Est.US$150