If you were to open your wallet right this moment and sift through the bills tucked inside, chances are extremely high that you’d come across at least one $1 bill. Most people never pay attention to their $1 bills — they’re so ordinary, so common, and often treated as the least valuable piece of paper currency we carry. After all, in today’s world, a single dollar doesn’t buy very much. It might get you a piece of candy, a parking meter minute or two, or nothing at all depending on where you live. Because of this, people tend to overlook their $1 bills entirely.

But what many people don’t realize is that some of these unassuming little bills could actually be worth far more than their printed value. In fact, if you take a moment to look closely at the serial numbers stamped on your $1 bills, you might discover that one of them is unusually valuable — potentially worth hundreds or even thousands of dollars. It sounds unbelievable at first, but there is a growing community of collectors who are willing to pay a premium for uncommon or unusually patterned serial numbers.

Right now, a website known as CoolSerialNumbers.com is actively buying U.S. currency that features what they call “fancy serial numbers.” These are unique combinations of digits that appear in rare patterns, making them interesting to collectors. And they’re not just looking for old bills or limited-edition prints — they’re specifically interested in the serial numbers, which means even a freshly printed $1 bill from recent years could unexpectedly be valuable.

If you happen to have one of these special serial numbers in your wallet, you might be sitting on a mini jackpot without even realizing it. Some bills that normally circulate for just one dollar can fetch serious money — sometimes hundreds, sometimes thousands — depending on the pattern and rarity. So what exactly should you be looking for when you sift through your bills?

Here are some of the highly sought-after serial number types:

 1. Seven repeating digits in a row

These appear on $1 Federal Reserve notes where the same digit repeats seven times consecutively. Examples include:

09999999

18888888

19999999
Serials like these are extremely rare and immediately catch the eye of collectors.

 2. Seven of a kind

These bills feature seven matching digits anywhere in the serial number. Examples include:

00010000

00090000

90999999
This pattern is also considered highly desirable due to its rarity.

 3. “Super radars”

A radar serial number reads the same forward and backward, but a super radar has an extended, more dramatic symmetry. Examples include:

01111110

10000001

80000008
These symmetry-based patterns make the bill extremely collectible.

 4. Super repeaters

These are serial numbers that alternate between two digits in a perfect repeating pattern. For example:

67676767
These rhythm-like sequences are easy to spot and highly valued.

 5. Double quads

These are serial numbers made up of two sets of four matching digits. Examples include:

11110000

44440000

88880000
Collectors love these because they combine repetition with strong numerical structure.

And believe it or not — this still isn’t everything. CoolSerialNumbers.com maintains an extensive “Want List” featuring even more patterns they are actively seeking. These can include low numbers, high numbers, birthday serials, ladder patterns (like 12345678), near-solids, bookends, trinaries, binaries, and many other rare combinations. If you have anything that fits one of their listed patterns, your ordinary $1 bill might suddenly become a valuable collectible.

It’s pretty astonishing when you think about it: an object as simple, common, and seemingly insignificant as a slightly crumpled $1 bill could actually put a surprising amount of money in your pocket. Many people toss $1 bills around carelessly or ignore them altogether, not knowing that some could be worth far more than they think.

So the next time you’re organizing your wallet, cleaning out your purse, or emptying the pockets of an old pair of jeans, take a moment to look. Really look. Check the serial numbers with patience and curiosity — because you never know what hidden treasure might be sitting right under your nose.

Today might truly be your lucky day.