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US bills printed prior to the 1990 redesign had very few anti-counterfeiting features. Among other items they didn't have watermarks, security strips, color-shifting ink, or microprinting. About all you can look for would be:

  • There should be small red and blue fibers embedded in the paper.
  • The "teeth" around the bill's seal(s) should be sharp and evenly-spaced.
  • The engraving should be crisp and clear. In particular the portrait should have an almost 3-dimensional appearance.
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10y ago

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