Do your dollar bills have an interesting set of serial numbers? They might be worth more! Collectors are looking for:
- 7 repeating digits in a row on $1 Federal Reserve Notes (i.e. 09999999, 77777776)
- 7 of a kind on $1 Federal Reserve Notes (i.e. 00010000, 99999099)
- Super repeaters on $1 Federal Reserve Notes (i.e. 67676767)
- Double quads on $1 Federal Reserve Notes (i.e. 00009999)
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