1918, Curtiss Jenny, 24c carmine rose and blue, central line block of four, full OG, NH and fine, C.v. $520 as four singles (Image)

1930-33, Zeppelin issue, $2.60 blue, nicely centered with intact perforation, and Baby Zeppelin 50c green, slight gum bend, both with full OG, NH, first one VF+, the last one has fine centering, C.v. $900 (Image)

1938, Eagle Holding Shield, 6c ultramarine and carmine, color variety, centerline block of four, strong colors and nice centering, full OG, NH, VF and scarce item, Bruechig guarantee hs and penciled position numbers on reverse, C.v. $1,200 (Image)

1971, Silhouette of Airliner, 11c carmine, horizontal imperforated pair of coil stamps, full OG, NH, VF, C.v. $200 (Image)

1988, Igor Sikorsky, (36c) multicolored with red, dark blue and black (engraved) omitted, right margin single, full OG, NH, VF and scarce, a common stamp is included, C.v. $1,150 (Image)

1989, 20th UPU Congress, Futuristic Mail Delivery, (45c) multicolored, se- tenant block of four with light blue (engraved) color omitted (country name and denomination), full OG, NH, VF, C.v. $500 (Image)