1918 6c green Air Post, never hinged, beautiful color and exceptional centering, extremely fine; with 2004 P.S.E. certificate. (Sc. C2, 90J, SMQ $295) (Image)

Est. $150-200

1918 24c carmine rose & blue Air Post, hinged in selvage only, the stamp n.h., upper margin plate No. 8492 single, superior centering, jumbo margins, a beautiful stamp, extremely fine; with 2006 Philatelic Foundation certificate (XF-S 95J) and 1995 P.S.E. certificate. (Sc. C3) (Image)

Est. $400-500

1918 24c carmine rose & blue Air Post, center line block of four, three stamps hinged, showing the "low flying Jenny" variety with the vignette significantly shifted downward, choice centering, visually striking, very fine. (Sc. C3var) (Image)

Est. $300-400

1918 24c carmine rose & blue Air Post, never hinged, the "low flying Jenny" showing the vignette shifted downwards, select centering, a lovely example of this ever-popular variety, very fine. (Sc. C3var) (Image)

Est. $100-150

1923 16c dark blue Air Post, never hinged, detailed impression, brilliant color, extremely fine; with 2006 P.S.E. certificate. (Sc. C5, XF 90, SMQ $225) (Image)

Est. $150-200

1923 24c carmine Air Post, never hinged, slightly sulphurized color, centered extremely fine; with 2006 P.S.E. certificate. (Sc. C6, XF 90, SMQ $130) (Image)

Est. $75-100

1926-7 10c dark blue - 20c yellow green Air Post, never hinged set of three, each fresh and exceptionally well-centered, extremely fine; with P.S.E. certificates (C7/8 XF-Sup 95, C9 XF-Sup 95J, SMQ $255) (Image)

Est. $150-200

1930 65c - $2.60 Graf Zeppelin Issue, lightly hinged, detailed impressions, a select, visually-appealing set, attractive and very fine. (Sc. C13-5, $1,060) (Image)

Est. $500-750

1930 65c-$2.60 Graf Zeppelin Issue, hinge remnants, fresh color, a pleasing set of these ever-popular stamps, chiefly fine-very fine. (Sc. C13-15, $1,060) (Image)

Est. $500-750

1933 50c green Century of Progress, never hinged, balanced margins, bright color, extremely fine; with 2004 P.S.E. certificate (Sc. C18, XF-Sup 95, SMQ $180) (Image)

Est. $100-150

Air Post group of high-grade singles, all never hinged and P.S.E. graded unless otherwise noted, consisting of C1 (oxidized, encapsulated, XF90), C4 (XF 90), C6 (VF-XF 85), C10 (XF-Sup 95), C11 (XF-Sup 95, encapsulated), C12 (XF-Sup 95), C19 (VF-XF 85J), C60 (XF-Sup 95), a lovely group, extremely fine. (SMQ $900) (Image)

Est. $500-750