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US bills dated before 1990 don't have very sophisticated anti-counterfeiting features. You won't find a watermark, security strip, or microprinting. About all you can do is:

- Look for tiny red and blue threads worked into the paper

- Check the engraving. It should be sharp and clear, with apparent depth.

- Look at the "teeth" of the Federal Reserve seal. They should be evenly-spaced and sharply pointed.

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14y ago

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