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“Toppan, Carpenter, Casilear & Co. BANK NOTE ENGRAVERS, Phila., New York, Boston & Cincinnati” one one line, with “No. X” showing the plate number on a line underneath.
The imprint is centered in the side margin, reading down in the left margin, and up in the right margin. The imprint and plate number are in the color of the stamp.
Used for the plates of the imperforate 1851 issue.
Toppan, Carpenter, Casilear & Co.