1918 6c orange, top margin, Arrow and Plate No. 9155 block of six, n.h., fresh, fine-v.f., cat. $1000 (Cat No. C1) (Image)

Cat. $1000, Est.US$450

1918 16c green, n.h., well centered, with 2021 PSE certificate graded "XF 90" (SMQ $190) (Cat No. C2) (Image)

Est.US$100

1918 16c green, n.h., well centered with wide margins, with 1984 and 1999 PFCs and a 2021 PSE certificate, the latter graded "XF-Sup 95" (SMQ $425) (Cat No. C2) (Image)

Est.US$200

1918 24c carmine rose and blue, well centered with jumbo margins, fresh color, with 1985 and 1999 PFCs and 2021 PSE certificate, the latter graded "XF 90J" (SMQ $300) (Cat No. C3) (Image)

Est.US$150

1918 24c carmine rose and blue, left sheet margin single, n.h., well centered, fresh color, v.f., with a photocopy of a 2018 PFC for a block of four from which this originated, cat. $130 (Cat No. C3) (Image)

Cat. $130, Est.US$100

1923 8c-24c set of three Washington, D.C. First Day Covers, prepared by Hammelmann, all locally addressed, v.f., cat. $1750 (Cat No. C4-6) (Image)

Cat. $1750, Est.US$800

1923 8c-24c set of three matching Edward C. Worden Washington D.C. FDCs, each with a "First Day Cover" hs at upper left, v.f., cat. $1750 (Cat No. C4-6) (Image)

Cat. $1750, Est.US$800

1923 8c dark green, left margin plate number block of six, n.h., well centered, fresh and v.f., cat. $330 (Cat No. C4) (Image)

Cat. $330, Est.US$250

1923 16c dark blue, n.h., well centered with wide margins, fresh color, with 1985 APS certificate and 2021 PSE certificate, the latter graded "XF-Sup 95" (SMQ $425) (Cat No. C5) (Image)

Est.US$200

1926-27 10c Map (7), 15c (1), 20c (2), selection of ten mostly different FDCs, various cities, first flights, many services by Albert E. Gorham, also C.E. Nickles and Hammelman, occasional toning, mostly fine-v.f. (catalogue value for covers without premium for cachets, flights and corner cards) cat. $1085 (Cat No. C7-9) (Image)

Cat. $1085, Est.US$250

1927 20c yellow green, n.h., near perfect centering, with 2020 PSAG certificate graded "98" (SMQ $275) (Cat No. C9) (Image)

Est.US$200

1927 10c Lindbergh, four different cacheted FDCs from Washington, D.C. (two including the first Mauck cachet), Detroit, Mi. and St. Louis, Mo., occasional toning, mostly fine-v.f., cat. $750 (Cat No. C10) (Image)

Cat. $750, Est.US$250

1930 Zeppelin, 65c-$2.60, set of three plate number blocks of six, exceptionally well centered, n.h. and post office fresh, v.f., cat. $15200 (Cat No. C13-15) (Image)

Cat. $15200, Est.US$7,000

1930 65c green and 50c Century of Progress, both l.h., well centered, fresh color, the former with 2014 PSE certificate graded "XF 90" and 2014 PFC graded "XF 90XQ" and the latter with 2013 PFC graded "XF 90" (SMQ $305, without premium for "XQ") (Cat No. C13,C18) (Image)

Est.US$150

1930 65c green, top margin plate number single, n.h., well centered, light horizontal crease, otherwise v.f., with 2021 PSE certificate, cat. $240 (Cat No. C13) (Image)

Cat. $240, Est.US$100

1930 65c green, n.h., well centered, fresh and v.f., with 2013 PFC, cat. $240 (Cat No. C13) (Image)

Cat. $240, Est.US$100

1930 65c green, n.h., well centered, fresh and v.f., cat. $240 (Cat No. C13) (Image)

Cat. $240, Est.US$100

1930 65c green, used, near perfect centering, with 2021 PSAG certificate graded "98" (SMQ $1,100) (Cat No. C13) (Image)

Est.US$500

1930 65c Zeppelin, nicely centered single, tied by April 19 Washington postmark on flown card, with imprint cachet ("the old English" design), Seville drop, v.f., cat. $1200 (Cat No. C13) (Image)

Cat. $1200, Est.US$750

1930 65c Zeppelin, used on 1c stationery card, Washington, April 19 first day cancelation, with appropriate Lakehurst and Europe-Pan-America Round Flight cachets, also on back violet rubber-stamped First Day Cover cachet, v.f. and rare (Cat No. C13) (Image)

Est.US$1,000

1930 65c Zeppelin, block of four on cover, Washington, April 19 first day cancellation, with appropriate Lakehurst and Europe-Pan-America Round Flight cachets, v.f. (Cat No. C13) (Image)

Est.US$1,000

1930 $1.30 brown, n.h., top margin plate number single, n.h., well centered, fresh and v.f., with 2021 PSE certificate, cat. $550 (Cat No. C14) (Image)

Cat. $550, Est.US$250

1930 $1.30 brown, l.h., nicely centered, with 2014 PFC graded "VF 80" (SMQ $400) (Cat No. C14) (Image)

Est.US$200

1930 $2.60 blue, n.h., top margin plate number single, n.h., well centered, fresh and v.f., with 2021 PSE certificate graded "XF 90" (SMQ $1,250) (Cat No. C15) (Image)

Est.US$500

1930 $2.60 blue, n.h., well centered with wide margins, fresh color, with 2008 PSE certificate graded "XF 90" and 2014 PFC graded "XF 90XQ" (SMQ $1,250 for "90" without premium for "exceptional quality") (Cat No. C15) (Image)

Est.US$600