1954 4c red violet Lincoln, postal counterfeit, block of four, n.h., v.f., cat. $300 (Cat No. 1036(CF1)) (Image)

Cat. $300, Est.$100

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

Est.$400

1959-85 test booklets, selection of 11 (eight different), overprinted or handstamped "Dummy", some with blank panes, fine-v.f., scarce group, cat. $980 (Cat No. TDB8/32) (Image)

Cat. $980, Est.$250

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

Cat. $375, Est.$250

1988 Space, $2.40 imperf. horizontal pair with USPS emblem at right margin, n.h., v.f., cat. $375 (Cat No. 2419b) (Image)

Cat. $375, Est.$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.$250

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

Cat. $750, Est.$500

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.$500

1991-94 19c imperf. block of six, "G" stamp and Christmas imperf. blocks of four, the latter slightly creased, n.h. (Cat No. 2529var,2711-14,2877) (Image)

Est.$100

1993 Test Stamp, unissued design (George Clinton) in blue gray inscribed "Experimental USA 00", sheet of 100, n.h., some minor creases, mostly v.f., cat. $15000 (Cat No. TD130F) (Image)

Cat. $15000, Est.$2,500

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 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.$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.$1,500