Air Post Stamps. 1931, Bleriot XI, imperforated proof of 15s in red (issued color), block of six triangle stamps, no gum as produced, NH, VF (Image)

Air Post Stamps. 1933, ''Latvia - Africa'' Flight, black overprints or surcharges on the third Bleriot XI issue, complete set of five, three with sheet margins, full original slightly toned gum on three low values, NH, VF, each value with expert's hs on reverse, C.v. $800 (Image)