1917 2c rose, top sheet margin strip of three, imperforate horizontally, n.h., top stamp with a natural gum skip, center stamp natural gum crease, well centered, nearly v.f., with 2023 PSE certificate. A rarity, one of only a handful recorded (catalogued as a vertical pair imperf. horizontally, with no premium for the additional stamp) cat. $4250 (Cat No. 499a) (Image)

Cat. $4250, Est.US$2,500

1917 3c dark violet, block of four imperf. horizontally, heavy h.r. at top, pencil notations on gum, usual centering, v.g., with 2023 PSE certificate (VG 50) cat. $2800 (Cat No. 502c) (Image)

Cat. $2800, Est.US$1,000

1917 50c red violet, vertical Plate No. 7057 pair with Akron, Ohio precancel, imperf. between at bottom, with 2023 PSE certificate stating "faint horizontal perforations in the bottom stamp", top stamp corner crease, rare (the only certified pair of 517b is imperf. at bottom off centered and Akron Ohio precanceled) (Cat No. 517var) (Image)

Est.US$500

1918 1c gray green, horizontal pair imperf. between, natural straight edge at right, h.r., fingerprint impression on back, with 2023 PSE certificate, cat. $750 (Cat No. 525c) (Image)

Cat. $750, Est.US$250

1918 1c gray green, double impression, right margin Plate No.9674 block of six, hinged in selvage only, stamps n.h., natural gum creases, top left stamp with a natural paper inclusion, rare Plate Block, with 2023 PSE certificate (Cat No. 525d) (Image)

Est.US$500

1918 3c purple, printed on both sides, h.r., rare stamp, with 2023 PSE certificate, cat. $750 (Cat No. 530b) (Image)

Cat. $750, Est.US$250

1920 2c carmine, Shermack type III private vending perforations, used on Aug.6, 1921 Window envelope from Chicago, fine, with 2023 PSE certificate, cat. $450 (Cat No. 534B) (Image)

Cat. $450, Est.US$200

1919 2c carmine rose, block of six (3x2), imperforate vertically except at left, h.r., fresh and very rare, with 2023 PSE certificate (catalogued as two horizontal pairs imperf. vertically, without premium for the extra stamps) cat. $5500 (Cat No. 540b) (Image)

Cat. $5500, Est.US$2,000

1922 5c dark blue, large die proof, die sunk on card, signed by the Postmaster General (Hubert Work), serial number (1176107) on back, v.f., rare, cat. $1000 (Cat No. 557P1) (Image)

Cat. $1000, Est.US$750

1922 20c carmine rose, large die proof, die sunk on card, signed by the Postmaster General (Harry S Neu), serial number (1211988) on back, h.r., v.f., rare, cat. $1000 (Cat No. 567P1) (Image)

Cat. $1000, Est.US$750

1923 $5 carmine lake and dark blue, center-line block of four, n.h., natural gum crease at top left, fresh, fine-v.f., cat. $1650 (Cat No. 573a) (Image)

Cat. $1650, Est.US$400

1923 1c-10c, complete set in blocks of four, n.h., fine-v.f. (catalogued as singles) cat. $1485 (Cat No. 581-591) (Image)

Cat. $1485, Est.US$300

1923 2c carmine, top Plate No. 14131 and 14732 block of four, each with star, l.h., some gum skips, usual centering, rare, cat. $4200 (Cat No. 595) (Image)

Cat. $4200, Est.US$400

1923 2c carmine, type II, coil pair and joint-line pair, both pairs n.h., fine (Cat No. 599A) (Image)

Est.US$400

1926 2c Liberty Bell, small die proof on india paper, large margins all around, fresh and v.f., rare, cat. $1500 (Cat No. 627P2) (Image)

Cat. $1500, Est.US$1,000

1926 White Plains souvenir sheet, 10 copies, l.h. or h.r., occasional perf. separations or gum creases possible, mostly fine-v.f. (Cat No. 630) (Image)

Est.US$1,500

1926 White Plains souvenir sheet, 10 copies, l.h. or h.r., occasional perf. separations or gum creases possible, mostly fine-v.f. (Cat No. 630) (Image)

Est.US$1,500

1926 White Plains souvenir sheet, n.h., well centered, v.f., cat. $500 (Cat No. 630) (Image)

Cat. $500, Est.US$250

1927 2c Valley Forge, small die proof on india paper, large margins all around, fresh and v.f., extremely rare, cat. $1500 (Cat No. 645P2) (Image)

Cat. $1500, Est.US$1,000

1927 5c Aeronautics, large die proof, die sunk on card, signed by the Postmaster General (Harry S. Neu), serial number (146710) on back, faint ageing, otherwise v.f., extremely rare, cat. $1500 (Cat No. 649P1) (Image)

Cat. $1500, Est.US$1,000