Roller Marks - What are Roller Marks on Coins?
From Susan Headley, former About.com Guide
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Roller marks
Term to describe the mostly parallel incuse lines seen on some coins after striking. These were originally thought to be lines resulting from debris “scoring' the metal strips before the blanks were cut.
roller marks: parallel lines caused when metal strips are flattened between two rollers. Roller marks are most often seen on the high points of Silver Dollars, especially those that were struck softly.
rub: friction.
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Roller marks
Parallel incuse lines found on a coin after it is struck.
Roller Marks - Coins with, usually parallel, incuse lines.
Round - A disc shaped piece of precious metal bullion.
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1574 1879-O AU-55 (PCGS). Attractive bright yellow gold surfaces. Somewhat prooflike. A series of parallel roller marks are noted in the reverse field below the eagle, this being as made.
Fine, incuse lines found on some Proof coins, though rarely on business strikes, usually the result of polishing blanks to impart mirrorlike surfaces prior to striking. See also adjustment marks, burnishing lines, die striations, roller marks.
 See also: Coin, Marks, Dime, Nickel, Mint
  
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