they used four digits for the plate numbers on bills. This bill hung around for fifty years to match up with 2024.
https://money.howstuffworks.com/symbols-dollar-bill.htm#:~:text=The%20numbers%20indicate%20which%20Federal%20Reserve%20Bank%20actually,District%20and%20is%20designated%20by%20the%20letter%20B.
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