1918-23 6c-24c blocks of four, hinged at top, bottom stamps n.h., fresh and well centered, fine-v.f. (catalogue value for singles) cat. $1935 (Cat No. C1-6) (Image)

Cat. $1935, Est.$500

1918 6c orange, top margin plate number block of six, n.h., fine, cat. $1000 (Cat No. C1) (Image)

Cat. $1000, Est.$600

1923 8c-24c blocks of four, hinged at top, bottom stamps n.h., fresh and well centered, fine-v.f. (catalogue value for singles) cat. $855 (Cat No. C4-6) (Image)

Cat. $855, Est.$250

1923 8c-24c blocks of four, n.h., well centered, fresh color, v.f., cat. $1140 (Cat No. C4-6) (Image)

Cat. $1140, Est.$350

1926 15c olive brown, n.h., near perfect centering, with 2021 PSE certificate graded "Superb 98" (SMQ $275) (Cat No. C8) (Image)

Est.$300

1927-30 10c booklet pane of three (2) and 50c Century of Progress, block of four with Plate No. at bottom, n.h., v.f., cat. $530 (Cat No. C10a,C18) (Image)

Cat. $530, Est.$250

1930 Zeppelin 65c-$2.60 set of three, used on flown card and two covers, fresh and v.f. (Cat No. C13-15) (Image)

Est.$500

1930 Zeppelin set of three, used on card and two covers, various markings, minor cover flaws, fine-v.f. (Cat No. C13-15) (Image)

Est.$500

1930 65c green, machine slogan cancel, well centered with wide margins, fresh color, with 2019 PFC graded "XF-S 95" (SMQ $425) (Cat No. C13) (Image)

Est.$300

1930 Zeppelin 1.30 brown, used on 5c stationery entire envelope flown on Round Flight (May 30) to Switzerland, with Friedrichshafen transit (6.6.) and Bern arrival pmks, fine-v.f. (Cat No. C14) (Image)

Est.$250

1930 Zeppelin $1.30 brown, used on Round Flight (May 24) cover to Germany, with Hamburg and Friedrichshafen (6.6.) markings (Cat No. C14) (Image)

Est.$250

1930 $2.60 blue, n.h., well centered with wide margins, bright color, with 2021 PSAG certificate graded "95" (SMQ $2,000) (Cat No. C15) (Image)

Est.$1,000

1930 Zeppelin $2.60 dark blue, bottom sheet margin single, v.f., used on flown 2c legal size envelope to Lakehurst, minor creases and toning away from the stamps (Cat No. C15) (Image)

Est.$500

1930 Zeppelin, $2.60 blue, used on May 7 New York Round-Flight cover, fine-v.f., with appropriate cachet and Lakehurst arrival pmk, addressee's name obliterated, fine-v.f. (Cat No. C15) (Image)

Est.$300

1877 5c deep blue, Buffalo Balloon (Schoendorf Type II), constant plate flaw variety, unused with full original gum, n.h., but with some adhesion on back, margins all around, v.f., with 1991 Bolaffi certificate (1979 PFC no longer accompanies). (The Buffalo Balloon stamp, designed by John F. B. Lillard and engraved by John H. Snively, was printed by Wheeler Brothers Printers in Nashville, Tennessee. The stamps were intended for use on a balloon flight from Nashville to Gallatin, which took place on June 18, 1877. Of the 300 printed, only 23 were used. At least some of the Buffalo Balloon stamps were exposed to moisture around the time they were printed and were probably stuck together. This accounts for the many without gum, disturbed gum or thinned examples sometimes encountered) (catalogued as hinged) cat. $7500 (Cat No. CL1) (Image)

Cat. $7500, Est.$6,000