1973, Progress in Electronics, 11c multicolored, a single with olive color omitted and only traces of vermilion frame are presented, full OG, NH, VF, C.v. $800 (Image)

1983, Los Angeles Olympic Games, 40c multicolored, right sheet margin ZIP imprint imperforate se-tenant block of four, full OG, NH, VF, C.v. $625 (Image)

1985, Trans-Pacific Air Mail, 44c multicolored, left sheet margin vertical imperforate pair, full OG, NH, VF, C.v. $550 (Image)

1989, 20th UPU Congress, Futuristic Mail Delivery, 45c multicolored, top right corner sheet margin se-tenant block of four with ZIP imprint, light blue color omitted, full OG, NH, VF, C.v. $475 (Image)

1991, Harriet Quimby, 50c multicolored, left sheet margin block of four, imperforate horizontally, perfect condition, full OG, NH, VF and scarce, C.v. $1,600 as two pairs (Image)

Pioneer Flights. FIRST OFFICIAL MISSILE MAIL: 1959, pre-printed Postmaster General publicity cover from the U.S.S. Barbero, franked by 4c dark blue and deep carmine, tied by official cachet without date, this cover is one of 100 prepared for distribution to the Press with appropriate text on reverse, VF, Est. $150-$200 (Image)

Zeppelin Flights. 1930 (May 18-June 6), South America Round Flight postcard, franked by Zeppelin stamp of 65c green, tied by Saint Joseph, MO ''APR.21.1930'' ds, German and American confirmation cachet, Friedrichshafen ''6.6.30'' arrival marking, VF, Est. $300-$400 (Image)

Zeppelin Flights. 1930 (May 18-June 6), South America Round Flight two covers, franked by Zeppelin stamps of 65c in horizontal pair or by a single of $1.30, each one cancelled with Lakehurst ''MAY.30.1930'' ds, German and American or American only confirmation cachet, first one with New York arrival of June 18, the other one with Seville drop of June 5, both are VF, Sieger #64, €1,300++ (Image)

Zeppelin Flights. 1930 (May 18-June 6), South America Round Flight cover, franked by Zeppelin stamp of $2.60 blue, tied by Varick St. Sta ''APR.21.1930'' ds, German and American confirmation cachet, Lakehurst ''MAY.31.1930'' arrival marking, VF, Sieger #64H, C.v. €900 (Image)

Zeppelin Flights. 1936 (May 6-9), Airship Hindenburg 1st NAF cover from Stuttgart to NYC with connection to American Clipper Flight to Philippines, mixed franking by five German (usual toning) and US Air Post stamps, letter ''f'' German confirmation marking, backstamped with New York ''5.9.1936'' and Manila ''May 16, 1936'', mostly VF, Est. $200-$250 (Image)

Zeppelin Flights. BALANCE OF ZEPPELIN AND AIRSHIP ''HINDENBURG'' FLIGHTS: 1928-36, 11 items, representing 5 different flights - US to Germany of 1928, Round the World of 1929, Chicago (Century of Progress) of 1933, 1st and 8th NAF of 1936, appropriate franking and postmarks, all housed on pages from the Collection, mostly VF, Sieger #22/438, C.v. €1,070 (Image)