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Could use some help identifying unique serial numbers on some bills

I have some bills with weird serial numbers. I've been trying to look it up but I don't know correct terminology. The serial for the$20 is AD62055004D, then it says D4 under that. Then I have a $100 , serial is HG02497228B and has G7 under that. I know I won't be getting rich off these, just looking for info about the#s


  • Steve_in_TampaSteve_in_Tampa Posts: 1,791 ✭✭✭✭✭
    edited December 8, 2023 11:52AM

    Welcome to the forum @DeniseT

    The number in green is the serial number and the letter/number below it is the Federal Reserve district identifier. It tells you what Federal Reserve District it was printed for. D4 which stands for Cleveland and G7 which stands for the Chicago district. See the chart below.

  • sellitstoresellitstore Posts: 2,368 ✭✭✭✭✭

    Yes, welcome the forum. We can help you understand what you are looking at and are happy to do so.

    The serial number is preceded and followed by a letter or two. These are prefix and suffix letters and, together, are known as the "block". The numbering starts with an "A" prefix and suffix and number A00000001A. When all of these numbers are used the AB block will be started with serial # A00000001B. Once you have gone through the alphabet with suffix letters, the prefix letter advances to "B" and the process is repeated. Now we use two prefix numbers because we print so many notes, the single letters aren't sufficient.

    OK, now who would like to take a crack at explaining the series date and how it differs from dates on coins? This is a good opportunity to get some basic information about small size currency here in order to appeal to the beginning collector or those just curious.

    Collector and dealer in obsolete currency. Always buying all obsolete bank notes and scrip.
  • Steve_in_TampaSteve_in_Tampa Posts: 1,791 ✭✭✭✭✭
    edited December 11, 2023 10:08AM

    OK, now who would like to take a crack at explaining the series date and how it differs from dates on coins?

    I’ll give it a try. The date on coins identifies the year the coin was minted. The series date on U.S. paper money identifies the year a design change was made to the denomination. A design change may be as simple as a change in Secretary of the Treasury or Treasurer or as complicated as a complete redesign. The series date has nothing to do with when the note was printed. Some series 1934 C and D $5,$10 and $20 notes were printed as late as the late 1940s through the early 1950s.

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