Federal Reserve Note District Mismatch Errors: When the Wrong Seal Meets the Wrong Serial Number Prefix
District mismatch errors on Federal Reserve Notes occur when a note is printed with a Federal Reserve district seal that does not correspond to its serial number prefix letter, creating one of the most visually dramatic and numismatically significant error types in modern US currency. This guide covers how these errors happen, how to authenticate them, and what collectors should know before buying or selling.
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