Error Note Chronicles: Inverted Overprint Errors

Error Note Chronicles: Printed Fold Error

Error Note Chronicles: National Bank Note Errors

Error Note Chronicles: Mismatched Serial Number Error

Error Note Chronicles: Obstructed Printing Errors

PCGS Banknote Error Designations

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Error Note Chronicles: Ink Smear Error

Your $5 bill may be worth thousands - the exact 'overprint' detail to look for

Error Note Chronicles: Errors in the Design of Notes

Error Note Chronicles: Inverted Back

1999 $1 FRN Inverted Black and Misaligned Back Print Double Currency E

Error Note Chronicles: Offset Printing Error

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Paper Money Mindset: Celebrating Errors

The inverted overprint error frenzy, 40 years later