1918-23 6c-24c and 8c-24c blocks of four, first three center-line, l.h. at top, bottom stamps n.h., 6c trifle oxidized, fine-v.f. (catalogued as singles) cat. $1935 (Cat No. C1-6) (Image)

Cat. $1935, Est.$500

1918-23 6c-24c blocks of four (6c center-line), 6c oxidized, also 8c-24c blocks of four, l.h., fine-v.f., fine-v.f., cat. $1470 (Cat No. C1-6) (Image)

Cat. $1470, Est.$250

1918-23 6c-24c center-line blocks of four, also 8c-24c blocks of four, l.h., few minor gum creases, well centered, mostly v.f., cat. $1470 (Cat No. C1-6) (Image)

Cat. $1470, Est.$400

1918 6c orange, 16c green, 24c carmine rose & blue, two sets of blocks of four, including arrow and center-line, l.h. or n.h., well centered, fresh, fine-v.f. (catalogued as singles), cat. $2145 (Cat No. C1-3) (Image)

Cat. $2145, Est.$500

1918 6c orange, four center-line blocks of four, n.h., well centered, mostly v.f., cat. $1760 (Cat No. C1) (Image)

Cat. $1760, Est.$500

1918-23 6c orange, 16c dark blue, top plate no. blocks of six, l.h., minor perf. separations, fine, cat. $2000 (Cat No. C1,C5) (Image)

Cat. $2000, Est.$300

1918 16c green, Top Arrow and Plate No. block of eight, well centered and fresh, fine-v.f., cat. $1225 (Cat No. C2) (Image)

Cat. $1225, Est.$250

1918 16c green, top margin plate number single, n.h., perfectly centered, an absolute gem, with 2018 PSAG certificate graded "100" (SMQ $4,100, one of only four to achieve this grade) (Cat No. C2) (Image)

Est.$2,500

1918 24c carmine rose & blue, left margin Arrow block of eight, top stamps h.r., other six stamps n.h., fine (catalogued as singles) cat. $1170 (Cat No. C3) (Image)

Cat. $1170, Est.$200

1918 24c carmine rose & blue, bottom arrow and center-line blocks of four, l.h. or h.r., fresh, fine-v.f., cat. $650 (Cat No. C3) (Image)

Cat. $650, Est.$150

1918 24c carmine rose and blue, bottom margin arrow block of four, n.h., fresh color, v.f., with 2019 PFC (catalogued as singles) cat. $520 (Cat No. C3) (Image)

Cat. $520, Est.$200

1918 24c carmine rose & blue, top arrow, double plate nos. 8493/8492 and double "Top" block of twelve, well-centered, bright colors, n.h., v.f., cat. $2000 (Cat No. C3) (Image)

Cat. $2000, Est.$1,000

1918 24c carmine rose & blue, "fast plane" variety shifted to left, block of four, l.h. at top, bottom stamps n.h., fine-v.f. (Cat No. C3var) (Image)

Est.$250

1930 Zeppelin 65c-$2.60 set of three, 65c sheet margin at left, l.h., $1.30 h.r., last one n.h., all v.f., cat. $1360 (Cat No. C13-15) (Image)

Cat. $1360, Est.$750

1930 Zeppelin 65c-$2.60 set of three, h.r., well centered, v.f., cat. $1060 (Cat No. C13-15) (Image)

Cat. $1060, Est.$500

1930 65c-$2.30, set of three, n.h., well centered, v.f., 65c with 1992 PFC, other two with 2004 PFC, cat. $1640 (Cat No. C13-15) (Image)

Cat. $1640, Est.$750

1930 Zeppelin 65c-$2.60 set of three top or bottom sheet margin Plate No. Blocks of four, h.r. or l.h. at top, bottom stamps n.h., well centered, fresh and v.f. (catalogued as four sets of singles) cat. $5400 (Cat No. C13-15) (Image)

Cat. $5400, Est.$2,500

1930 Zeppelin 65c-$2.60 set of three top sheet margin Plate No. Blocks of four, h.r. at top, l.h. at bottom, well centered, fresh and v.f. (catalogued as four sets of singles) cat. $4240 (Cat No. C13-15) (Image)

Cat. $4240, Est.$2,000

1930 Zeppelin 65c (vertical pair), $1.30 and $2.60 on flown covers (last two 5c stationery entires), faint toning, otherwise fine-v.f. (Cat No. C13-15) (Image)

Est.$500

1930 65c green and $1.30 brown, each used on separate picture postcard, with all appropriate markings, fine-v.f., cat. $535 (Cat No. C13-14) (Image)

Cat. $535, Est.$250

1930 65c green, n.h., well centered, v.f., with 2019 PFC for a block of four from which it originated, cat. $240 (Cat No. C13) (Image)

Cat. $240, Est.$200

1930 65c green, n.h., perfectly centered, a true gem, with 2019 PSAG graded "100" (SMQ $4,450) (Cat No. C13) (Image)

Est.$2,500

1930 Zeppelin 65c green, right sheet margin Plate No. block of four, n.h., v.f. (catalogued as four singles) cat. $960 (Cat No. C13) (Image)

Cat. $960, Est.$300

1930 Zeppelin 65c green, used on registered Washington D.C. FDC to Buffalo, N.Y., v.f., cat. $1000 (Cat No. C13) (Image)

Cat. $1000, Est.$500

1930 $1.30 brown, n.h., well centered with wide margins, with 2018 PFC graded "XF 90" (SMQ $800) (Cat No. C14) (Image)

Est.$600