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R1

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R1
“ENGRAVED BY [Butler & Carpenter] PHILADELPHIA” on one line with “Plate No.” on the line below.
This was usually followed by the plate number and usually a letter, but does occur without a plate number.
The words “Butler & Carpenter” are in white on a colored tablet, other parts of the imprint are in color.
This was the most common imprint used on the first issue of revenue stamps.

F4

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F4
“No. 482 in italics of the same size as imprint F, centered in the top margin, with “AMERICAN BANK NOTE COMPANY, NEW YORK” in very small print centered under the plate number.
Used only on Newspaper plate 482.

F3

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F3a
Similar to imprint F, but with a serial letter of pair of letters on the opposite side of the imprint from the plate number.
Used on all positions of the Columbian issue of 1893

F2

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F2a
Similar to imprint F, but with a serial letter followed by an italic “1” of the same size as the numerials of the plate number on the opposite side of the imprint from the plate number.
Used on all positions of plate 270-349 of the 1890 issue

F1

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F1
Similar to imprint F, but with a serial letter or pair of letters in solid block color between the imprint and plate number.
Used on the top positions of plates 483-7, 490-4 and 497-723 (except 552) of the 1879 issue, and on top and bottom positions
of plates 1-20, 26-71, 74-269 of the 1890 issue.

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