1923 16c dark blue, n.h., well centered with wide margins, fresh color, with 2003 PSE certificate graded "XF-Sup 95" (SMQ $425) (Cat No. C5) (Image)

Est.$350

1923 24c carmine, n.h., near perfect centering with wide, even margins, fresh color, with 2020 PSAG certificate graded "98" (SMQ $1,200) (Cat No. C6) (Image)

Est.$750

1930 Zeppelin 65c-$2.60 set of three, sheet margin singles, well centered, n.h. and post office fresh, 65c with natural gum skip, v.f., cat. $1640 (Cat No. C13-15) (Image)

Cat. $1640, Est.$750

1930 Zeppelin, set of three, 65c with plate number at left, used, well centered, v.f., cat. $1050 (Cat No. C13-15) (Image)

Cat. $1050, Est.$400

1930 $1.30 brown, n.h., near perfect centering, fresh color, with 2020 PSAG certificate graded "98" (SMQ $3,500) (Cat No. C14) (Image)

Est.$2,500

1930 $2.60 blue, used, well centered with wide margins, nice color, with 2021 PSAG certificate graded "95" (SMQ $1,250) (Cat No. C15) (Image)

Est.$750

1938 6c ultramarine and carmine, left sheet margin single, n.h., light natural gum bend, v.f., signed Bloch, cat. $210 (Cat No. C23c) (Image)

Cat. $210, Est.$100

1969 10c Moon Landing, plate block of four with a portion of the rose red omitted, also block of four with most of rose red omitted, n.h., v.f., each with 2021 PFC (Cat No. C76var) (Image)

Est.$250

1934 cover with U.S. and Polish franking, special cachet and signed by both Adamowicz brothers, v.f. (on June 28, Benjamin and Joseph Adamowicz took off from Floyd Bennett Field in NYC and landed in Harbour Grace, Newfoundland. The next day, they took off from there for a Trans-Atlantic trip. Through mechanical problems, leaking engine and heavy rainstorm, they managed to reach Europe (near Caen in France). The next day, after repairing a landing gear, they took off to Paris, then to Germany, where they were forced to land due to fuel leaks. On July 2, the brothers arrived in Warsaw, Poland, treated as heroes. The Adamowicz brothers were possibly the first amateur pilots in the world to fly a plane across the Atlantic) (Image)

Est.$150

1930 (May 6) legal size envelope for G.M.Hart, U.S. Geological Survey, Washington, D.C. franked with $1.30 and $2.60 Zeppelin adhesives, with Europe-Pan-America Round Trip flight cachet and "This Article Made the Complete Round Trip Via Graf Zeppelin", Friedrichshafen and New York pmks on back, v.f. (Cat No. C14,15) (Image)

Est.$300

1937 Round the world "Airplane plus Zeppelin" cover endorsed "By Trans-Pacific Route to Hong Kong, thence by fastest route to Frankfurt, thence by Zeppelin to the United States". Actually the cover "almost made it" to be flown on the ill-fated Hindenburg 1st flight (in Frankfurt on April 29), but got delayed in processing, and thus avoided destruction, eventually arriving in the United States in June 1937, attractive United States, Hong Kong (Jubilee set) and German franking and appropriate cancels (Image)

Est.$250