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To detect a counterfeit old $100 bill, especially a vintage 1981 hundred dollar note in mint condition, examine several features. Authentic bills feature intricate security designs, such as watermarks, security threads, and color-shifting ink. The portrait of Benjamin Franklin should be clear and detailed. Verify the serial numbers and look for any irregularities in paper quality or printing. Rare error currency may be worth significant amounts, but careful inspection is crucial to avoid fakes.

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