1918 6c orange, v.f., tied by violet four-bar cancel on first flight cover from Philadelphia to Washington, with corresponding "Air Mail Service Wash. N.Y. Phila. Dec 16, 1918, 9AM" departure pmk alongside, sent by Philip Ward, v.f., signed Schoendorf, cat. $2000 (Cat No. C1) (Image)

Cat. $2000, Est.$750

1918 6c orange, fine, tied by black four-bar cancel on first flight cover from Philadelphia to New York, addressed to Stanley Gibbons Inc., endorsed "via Aeroplane Mail", with corresponding "Air Mail Service Wash. N.Y. Phila. Dec 16, 1918, 11AM" departure pmk alongside, fine cover, cat. $2000 (Cat No. C1) (Image)

Cat. $2000, Est.$750

1918 16c dark green on July 15, 1918 first flight cover from Philadelphia to New York, v.f., cat. $800 (Cat No. C2) (Image)

Cat. $800, Est.$500

1923 8c green, used on Washington Aug.15 FDC, legal size Shoreham Hotel corner card with some creases and tears, otherwise fine, cat. $400 (Cat No. C4) (Image)

Cat. $400, Est.$150

1926-27 Maps, complete set of three large die proofs, each die sunk on full card, with serial number on back, dated and signed by Harry S. New, the Postmaster, fresh and v.f. set of these rare die proofs, one of only 2-3 known, cat. $9000 (Cat No. C7-9P) (Image)

Cat. $9000, Est.$7,500

1930 Zeppelin 65c-$2.60 set of three, l.h., well centered, v.f., cat. $1105 (Cat No. C13-15) (Image)

Cat. $1105, Est.$500

1933 50c green, single & pair, used on Oct 4 New York on Zeppelin card from Friedrichshafen to Chicago, v.f. (Cat No. C18) (Image)

Est.$200

1963 8c Carmine, complete booklet of five panes, pink covers, fresh and fine-v.f. (BKC17) cat. $500 (Cat No. C64c) (Image)

Cat. $500, Est.$150

1929 (1 May) first flight Kansas City to Lancaster, Pa, attractively franked with Plate No. strip of three of 2c George Rogers Clark, tied by special cachet, signed by the postmaster, pilot and President Herbert Hoover (Image)

Est.$150

1932 (July 5), Mattern and Griffin Round the World Flight. The U.S. pilot Jimmy Mattern, together with Lt. Griffin, took off from Floyd Bennet Field in an attempt to beat the round-the-world record held by Post and Gatty. The fliers landed in Berlin after a trip of 31 hours and 41 minutes, from New York, via Harbor Grace. They later reached Moscow, but cracked up on their hop to Siberia. Cover franked with 5c U.S. (New York July 5), 4pf Germany (July 7) and 15k Russia (cancelled Minsk 7.7), addressed to Clarence E. Page and autographed by both pilots, some usual minor adhesive toning, of no consequence. One of only 10 (!) covers carried on this flight (Cat No. AAMC TO 1167) (Image)

Est.$750