Air Post stamps and covers. 1929, Eagle, perforated proof of 25c in brown and green, nicely centered and very fresh, full OG, hinged, VF, only 50 stamps were printed (Image)

Air Post stamps and covers. 1929, Eagle, imperforated proof of 25c in green and brown, horizontal pair, nice four-side margins, full OG, hinged, VF and scarce, only 50 stamps were produced (Image)

Air Post stamps and covers. 1939, Sarabia Flight from Mexico City to New York, registered cover franked by three stamps, including a single of 20c with Sarabia overprint, tied by ''Servicio Aereo Mexico D.F.'' date stamp, violet flight cachet, New York arrival and several other markings on reverse, VF (Image)