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Editor’s Note: This story originally appeared on The Penny Hoarder.
Pull any bill out of your wallet. See the dark green numbers on the top-left or top-right corners? They could mean your bill is worth much more than its face value.
If a serial number’s digits are unique or interesting, collectors might be willing to pay big bucks — hundreds or even thousands of dollars — for your bill. You’ll make the most profit off a $1 bill with a fancy serial number, since its face value is lower than, say, a $20 bill, but it’s worth scrutinizing all your cash. Who knows what your $100 bill could actually be worth?
Knowing what your paper money might be worth is all in the serial number.
What Are Serial Numbers?
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Serial numbers are eight-digit-long codes that are unique to each bill. They are accompanied by other identifying letters and numbers that tell us which series year the bill is from and where it was printed. They are found on the front of U.S. currency and are always printed twice.
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