1948 United States-Canada Friendship Issue, 3c trial color large die proof in brown violet, die mounted on card (202x156mm), with blue control no. and engraver's stock proof handstamp on reverse, v.f. and rare unlisted die proof (Cat No. 961TC1) (Image)

Est.US$1,500

1950 American Bankers Association, 3c trial color large die proof in green, die mounted on card (202x152mm), with blue control no. and engraver's stock proof handstamp on reverse, minor corner bend, v.f. and rare unlisted proof (Cat No. 987TC1) (Image)

Est.US$1,500

1952 B. & O. Railroad, 3c trial color large die proof in blue, die mounted on card (202x152mm), with blue control no. and engraver's stock proof handstamp on reverse, v.f. and rare, cat. $1750 (Cat No. 1006TC1) (Image)

Cat. $1750, Est.US$1,500