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The small number in the lower-right corner is called a plate serial number. It identifies which printing plate was used to print each bill. Check various $1 bills and you'll see different serial numbers.

Other marks include a letter/number combination like C7; these are position indicators that identify which row and column the bill occupied on the printing plate. If the position indicator has a tiny "FW" in front of it, that means the bill was printed in Fort Worth rather than Washington.

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12y ago

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