Currency printing errors is another area of paper money collecting. While the U.S. Bureau of Engraving stops most errors from reaching the public, inevitably errors do find their way to the numismatic market and ultimately to collectors. Types of errors include:
- Board Break
- Double denomination
- Faulty alignments
- Ink errors
- Mismatched serial numbers
- Gutter folds
- Obstructions
- Stuck digits
- Cutting errors
- Offset printings
- Overprints
- Double errors
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