6˘ Lincoln -
http://www.1847usa.com/1870/BankNote06c.htm Quote:
If the stamp was printed on hard white paper and does not have the secret mark, it was printed by the National Bank Note Company and is either Scott 137, with grill, or Scott 148, without grill.
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If the stamp was printed on hard white paper and it does have the secret mark, it was printed by the Continental Bank Note Company and is Scott 159.If the stamp was printed on "soft porous" paper, it is an American Bank
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Note printing, either Scott 186 or Scott 208. Compare the number of lines in the panel to the left of the inner frame as shown in the illustrations above to determine whether the stamp is the original or re-engraved design. The lines in the panel must be distinct for the stamp to be a Scott 208. Also note the muddy color of the re-engraved stamp.
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The Special Printings, Scott 170 and 195, are mentioned here merely for completeness. Only 185 copies, total, of Scott 170 and Scott 195 were sold, and they were never issued for postal use, rather for collectors only. These stamps are so rare, only 65 copies are known, they seldom come up for sale except in the sale of a major U.S. Collection.