1851 12c Black, Diagonal Bisect (17a)
Bottom left half used with 1c Blue (7), and 3c Dull Red (11) tied by grids and matching OCT 23 U.S. EXPRESS MAIL postmark on cover front to St. John, New Brunswick. Fine, one of only three or four 12c bisects used to pay the 10c rate to New Brunswick. Ex Chase and Ward with Philatelic Foundation certificate (1994) and 1972 opinion from Robson Lowe. Scott retail $2,500.00 for use on cover.