1930 Zeppelin, 65c-$2.60, set of three, $2.60 with plate number at right, n.h., well centered, $1.30 with some gum wrinkles, v.f., with 2007 PSE certificate for the $2.60, cat. $1750 (Cat No. C13-15) (Image)

Cat. $1750, Est.$700

1930 Zeppelin, set of three, n.h., well centered, few natural gum bends, still v.f., cat. $1750 (Cat No. C13-15) (Image)

Cat. $1750, Est.$700

1933 Century of Progress, 50c green, single and vertical pair used on legal size cover from New York, Oct. 2 (First Day) to Chicago, with Oct. 26 arrival pmk (Cat No. C18) (Image)

Est.$150

1933 50c green, eight stamps used on seven flown Zeppelin covers, various destinations and dates, mostly fine-v.f. (Cat No. C18) (Image)

Est.$200

1947 15c bright blue green, horizontal pair, imperf. between, n.h., usual centering, fine, only 20 pairs exist according to Datz, with 2000 PFC, cat. $1500 (Cat No. C35a) (Image)

Cat. $1500, Est.$1,000

1928 Jimmy Doolittle, five flown and autographed covers addressed to Curtis Airplane Export Co., each with printed "Carried by Jimmie Doolittle, Pilot," also cachets including "First Experimental Flight Lima-La Paz", "Montevideo-Rio de Janeiro", "La Paz-Santiago", "Santiago-Buenos Aires", "Buenos Aires-Asuncion", accompanied by a letter headed Shell Petroleum Co., dated Feb 2, 1935 (Image)

Est.$1,000

1931 small card addressed to Mrs. Alfred Lee, with an attractive airplane label, signed on reverse in pencil by Amelia Earhart, v.f. (Image)

Est.$500