GROUP OF 10 PIONEER FLIGHTS: 1919-76, postcard commemorating Harry Butler Flight across St. Vincent Gulf of 1919 (creased), two questionable covers of Fremantle-Derby and Fremantle-Geraldton, First Trans-Continental Aerial Mail Perth-Sydney of 1929, Australia-England Experimental Flight of 1932 and others, in addition Australian Antarctic FDC and two modern flown covers from Papua New Guinea, some flaws mentioned, still F/VF, Est. $300-$400 (Image)

1925-30, Pilot, Crane and Airplane, 2g-10s, complete set of 20, fresh quality, full OG, NH, mostly VF, C.v. $325, ANK #468-87, €450, Est. $150-$200 (Image)

1925-30, Pilot, Crane and Airplane, 2g-10s, imperforated complete set of 20 in horizontal pairs, full OG, LH (all Pilot stamps) or no gum as issued, NH, all are VF, ANK #468U-87U, €5,000 as singles, Est. $1,200-$1,500 (Image)

1935, Airplanes over Landscapes, 5g-10s, complete set of 15, post office fresh quality, full OG, NH, VF, ANK #598 -612, €240 (Image)

1931 (October 16), Air Post Exhibition in Antwerp, four Air Post covers sent from Exhibition to Paris, London, Amsterdam and Malmö, each one bearing specially overprinted for each city semi-official stamp of 50c blue along with appropriate franking, confirmation markings, labels and arrival ds, VF, Est. $250-$300 (Image)

1924, National Aviation School issue, 10c-5b, perforated complete set of seven and 2b brown and black in bottom sheet margin vertical imperforated pair, full OG, NH (pair and several low values of the set) or LH/hinged, VF and scarce only 50 imperforated pairs possible, C.v. $462.50 as hinged, Est. $300-$400 (Image)

1924, National Aviation School, imperforated trial color proof of 5b in green and black, left margin horizontal pair, no gum as produced, NH, VF, Est. $150-$200 (Image)

1924, National Aviation School, 10c-5b, complete set of seven, diagonal black overprint ''Specimen'' and puncture at right, full OG, NH (4) or LH/hinged, mostly VF, Est. $150-$200 (Image)

1924, National Aviation School, 10c-5b, complete set of seven, diagonal red violet overprint ''Specimen'', full OG, mainly LH, F/VF, Est. $150-$200 (Image)

1924, National Aviation School, 10c-5b, complete set of seven, positional blocks of six (2x3) 10c, 25c and 50c, three-side margin block of ten (5x2) of 2b with complete inscription on bottom selvage, perforated proof of 10b in brown orange and black and more, full OG, NH or LH/hinged, mostly VF and interesting assemblage, Est. $300-$400 (Image)

1928, Lloyd Aereo Boliviano's Emblem, 15c-35c, complete set of three, imperforated 15c green in two horizontal pairs (one - NH, one - postally used) and block of four, as well as Pioneer Flight cover bearing the complete set with three other definitives, nice and fresh unit, full OG, NH or used, VF, Est. $250-$300 (Image)

1930, Zeppelin surcharge and overprints, set of five together with 2b brown in block of four used in 1948 on registered air mail cover from La Paz to NYC, app appropriate markings and arrival ds, VF, Est. $100-$150 (Image)

1930, Airplane over Landscapes of Bolivian Oriental Region, 5c-3b, perforated complete set of eight and First Flight cover from La Paz to Rio franked by complete set with all appropriate markings, set with full OG, LH/hinged, both items are VF, Est. $150-$200 (Image)

1930, Airplane over Landscapes of Bolivian Oriental Region, 5c-3b, perforated and imperforated complete sets of eight, the last one in horizontal pairs, all are in mounts of two pages from a Collection, full OG, NH or LH/hinged, VF, C.v. $504, Est. $250-$300 (Image)

1930, Airplane over Bullock Cart (instead of River Boat), set of five die proofs of 15c in carmine, purple, green (cut down and mounted on card), red and brown, printed in thickened paper, no gum as issued, VF and rare, Est. $500-$600 (Image)

1930, Airplane over River Boat (instead of Bullock Cart), set of three die proofs of 3b in purple, brown and red, printed in thickened paper, no gum as issued, VF and rare, Est. $300-$400 (Image)

1930, Airplane over Landscapes of Bolivian Oriental Region, 20b-3b, set of six values with diagonal overprint ''Specimen'' and security punches at bottom right, all with full OG, NH, VF, Est. $100-$150 (Image)

1932-35, Aztec and Map Air Post issues, 5c-1b and 5c- 10b, complete sets of seven or ten, plus M. Baptista stamp, unissued surcharge (defected) used high values of Aztec, Map set of Specimens, in addition one cover, all neatly arranged on pages from a Collection, full/part of OG, F/VF, Est. $150-$200 (Image)

1930 (July 30 - August 1), First Flight Lloyd Aero Boliviano cover from La Paz to Rio de Janeiro, franked by complete Airplane over Landscapes set of eight, confirmation label on front and violet cachet on reverse, special arrival markings on front and reverse, VF, Est. $150-$200 (Image)

1936, ''Europa - Sudamerica in 3 Tagen'' (Europe - South America in 3 Days), poster stamp in blue and gray promoted flights by Air France, Lufthansa and Graf Zeppelin, full OG, NH, VF and apparently scarce in premium quality (Image)

1937, Surcharges on Aviation School, Lloyd Emblem, Landscapes and commemorative stamps, 5c/35c-10b/5b, the total is 35 stamps, one sheet of 25 (No.C60) and two covers, representing 14 surcharge varieties, including 0.05c/35c brown red and black instead of red surcharge 10b/5b (single and on cover), all arranged on pages from a Collection, nice quality unit, full/large part of OG, VF, Est. $500-$600 (Image)

GROUP OF 9 PIONEER FLIGHT COVERS: 1933-54, Gambia-England Flight of 1934, Gold Coast-Germany of 1937, Mauritius-Reunion of 1947, Nigeria-England of 1936, Swaziland-France of 1939, and four different Zanzibar items of 1933-54, minor flaws should be expected, still F/VF, Est. $250-$300 (Image)

1926, Jack V. Elliot Air Service, (25c) red on yellow background, complete sheet of eight, stamp on position 8 with white spot in the middle, full OG (a few spots of gum loss at lower left stamp), LH, VF, C.v. $550, Est. $150-$200 (Image)

1926, Elliot-Fairchild Air Service, (25c) blue on yellow background, two complete panes of eight, one of which with inverted stamp on position 4, ''filled-in wing'' on position 1 of each pane, minor perf separation (tete-beche pair is not affected) and some selvage pieces missing, still full OG, NH, F/VF, C.v. $847.50 as singles, Unitrade #CL9, d, C.v. $1,012.50, Est. $350-$400 (Image)

1926, Elliot-Fairchild Air Transport Ltd., (25c) red with large perforation, complete pane of five, 4th stamp with white dot over ''o'' in ''Elliot'', full OG, NH (2nd and 3rd stamps) or LH, VF, C.v. $375 as singles, Est. $150-$200 (Image)