Error Note Chronicles: Inverted Overprint Errors

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Error Note Chronicles: Insufficient Inking

Clay Irving Collection - Error Notes

reverse overprint on a 1977 U.S. $10 note

Error Note Chronicles: Dual Denomination Error

Error Note Chronicles: Overprint on Back Error

Error Stamps, Postage Stamp Errors

Error Note Chronicles: Mismatched Prefix Error

Error Note Chronicles: National Bank Note Errors