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US bills dated before 1990 have very few anti-counterfeiting features. E.g. they don't have watermarks, security strips, or microprinting. You can look for the following, however:

  • There should be tiny red and blue fibers visible in the paper
  • The "teeth" on the two seals should be sharp and evenly spaced.
  • Engraving lines, especially those on Jackson's portrait, should be crisp and well-defined.
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10y ago

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