1959 unlisted test pane of four uncut booklets, 100 stamps in total, v.f. (Image)

Est.US$400

1979 $1.00 Rush Lamp & Candle Holder, intaglio brown color inverted, n.h., v.f. The so-called CIA invert is one of the best known inverted color errors in United States philately (these stamps were discovered by an on-duty CIA employee who teamed up with some colleagues to purchase the pane from a post office. Saving a copy each, the group later sold the bulk of the sheet to a prominent stamp dealer. News of the error reached CIA officials who sought to claim ownership, and US Postal authorities tried to recover the stamps. Official queries, threats, and even job losses followed the group until the sale of the pane was ruled legal) cat. $17000 (Cat No. 1610c) (Image)

Cat. $17000, Est.US$15,000

1980 18c George Mason, tagging omitted, sheet of 100, n.h., fine-v.f., with 2005 APS certificate ("tagging omitted error on unused pane of 100, with traces of tagging" on ten different stamps) (catalogued as 90 errors) cat. $1350 (Cat No. 1858a) (Image)

Cat. $1350, Est.US$250

1988 Space, $2.40 imperf. horizontal pair, n.h., v.f., cat. $375 (Cat No. 2419b) (Image)

Cat. $375, Est.US$250

1988 Space, $2.40 imperf. horizontal pair with "1" imprint at upper left, n.h., v.f., cat. $375 (Cat No. 2419b) (Image)

Cat. $375, Est.US$250

1988 Space, $2.40 imperf. lower right sheet corner margin Plate No. Block of four, n.h., little soiling in margin, stamps v.f. (catalogued as two imperf. pairs) cat. $750 (Cat No. 2419b) (Image)

Cat. $750, Est.US$500

1992 Eagle and Shield only, large model printed directly on card, with some penciled additions, edge toning, otherwise v.f. (Cat No. 2595P) (Image)

Est.US$500

1992 Eagle and Shield only, three different stage die proofs on india, some toning, rare (Cat No. 2595P) (Image)

Est.US$500

1995 Milton Hershey, 32c die proof on gummed paper, guide-line markings on all sides, faint impression of date at right, scotch taped on top, otherwise v.f. (Cat No. 2933P) (Image)

Est.US$250

1998 Space Shuttle Issue, $2.20 magenta and $11.75 cyan (colors only), imperforate vertical gutter, unfolded se-tenant pane of 50 (25 of each value) on coated, ungummed paper, v.f., with PFC (singles and se-tenant gutter pairs are illustrated in 2020 Scott Specialized catalogue in the "Trial color, die and Plate Proofs", page 954) (Cat No. 3261-62Pa) (Image)

Est.US$1,500

1998 Space Shuttle Issue, $2.20 magenta and $11.75 cyan (colors only), imperforate vertical gutter, unfolded se-tenant pane of 50 (25 of each value) on uncoated, ungummed paper, v.f., with PFC (singles and se-tenant gutter pairs are illustrated in 2020 Scott Specialized catalogue in the "Trial color, die and Plate Proofs", page 954) (Cat No. 3261-62Pb) (Image)

Est.US$1,500