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Before 1990 US bills didn't incorporate high-tech features such as watermarks, UV strips, or microprinting. About the best you can do at home would be the following:

> Look for tiny blue and red fibers embedded in the paper. These are tiny bits of very fine thread that were mixed in with the paper because they're difficult for a counterfeiter to reproduce.

> Check the teeth (points) around the Treasury Seal. They should be sharp and evenly spaced.

> Look closely at the engraving of Grant's face. Again, the lines should be sharp and clear. The image should have a certain amount of apparent depth to it.

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10y ago
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Q: How can you tell if an old 50 dollar bill is real?
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