Go ahead and check the cup holder in your car, the jar on the dresser, the forgotten coffee can in the back of a cabinet. Somewhere in all that loose change, you might be sitting on a small fortune and not even know it.

One particular penny floating around the country has sold for nearly $19,000 at auction, and it looks almost exactly like every other penny you've ever spent.

It's called the 1982-D Small Date copper penny, and it's one of the rarest and most sought-after modern coins in America.

Here's the part that should make everyone in Wisconsin perk up: the only two ever confirmed have both turned up in everyday circulation, and the very first one was found just across the border in neighboring Minnesota.

If it surfaced once that close to home, there's no reason another couldn't be hiding in a Wisconsin change jar right now.

Before you start digging through the couch cushions, here's what you need to know about this little copper treasure, including the four things that separate a five-figure penny from an ordinary one-cent piece.

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The Treasure Penny Turned Up Right Next Door

This isn't just a fun "what if." The first 1982-D Small Date copper penny ever confirmed was reportedly discovered by Paul Malone, a collector from Minnesota, on November 23, 2016.

As the story goes, he found it in the last handful of coins from a $50 bag of pennies he'd bought, while sorting 1982 cents by weight to save the copper ones. He later said that if not for a snowstorm and having nothing better to do, he never would have picked up that bag in the first place.

Malone's coin went on to sell for a stunning $18,800 at a Stack's Bowers auction in August 2017.

Only one other has surfaced since. A separate second coin authenticated in 2019 sold for $10,800 through Heritage Auctions. Its finder stayed anonymous, so there's no telling where that one came from.

Those two are still the only ones ever confirmed, which means any others are out there somewhere, waiting to be noticed. And if Minnesota can turn one up, why not Wisconsin?

So what would one be worth today? Estimates vary, but appraisers at American Rarities suggest that even a circulated example could fetch about $15,000, with a high-grade specimen likely commanding a mid-five-figure price at auction, as in that original $18,800 sale.

In other words, if you found one, you'd be holding one of the most valuable pennies in the country.

Why This Penny Is Worth So Much

The value comes down to a happy accident at the U.S. Mint. In 1982, the rising cost of copper pushed the Mint to switch the penny from its traditional copper composition to the cheaper copper-coated zinc we still use today.

During that changeover, a few leftover copper blanks accidentally got struck with the new dies — the same kind of fluke that created the legendary 1943 copper penny.

The result is a coin that, frankly, shouldn't exist. And because only a tiny number slipped through, finding one is like spotting a needle in a haystack of nearly 17 billion pennies minted that year.

The good news? It looks just like an ordinary penny, so it could easily be passed over in everyday change, waiting for someone to notice it.

The 4 Things To Look For

Authenticating one of these requires hitting all four marks. Miss even one, and it's just a regular penny. Here's the checklist, according to numismatic experts:

1. The Date. It has to read 1982. No exceptions. This was the only year the Mint made the switch, so the date is your starting point.

2. The "D" Mint Mark. Look just below the date for a small letter "D," which means the coin was minted in Denver. The valuable transitional error only exists with the Denver mint mark — a plain 1982 or one with no mint mark won't cut it.

3. The Weight. This is the big one. A genuine copper penny weighs about 3.1 grams, while the common zinc version weighs roughly 2.5 grams. That difference is tiny, so you'll need a sensitive digital scale — the kind jewelers use. These have gotten cheap, often running around $15 online.

4. The Small Date. This is the trickiest part, so grab a magnifying glass or zoom in with your phone camera. On the Small Date version, the numbers in the 1982 line up evenly across the top and bottom, and the "2" has a little serif with a curved base. On the more common Large Date, the "8" sits noticeably higher than the other numerals.

Should You Start Checking?

Here's the truth: the odds aren't great. Only two of these have ever been confirmed in more than 40 years, so nobody should expect to retire off their change jar. But that's also what makes it fun.

The coin could be anywhere — a register till in Milwaukee, a coin roll from a bank in Superior, or a forgotten jar in a Wisconsin basement. And with one already found right next door, the idea isn't as far-fetched as it sounds.

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If you do find a 1982 penny that hits all four marks, don't sell it at the first offer. The smart move, according to numismatic experts, is to have it authenticated by a professional grading service like PCGS or NGC before anything else.

Then again, even if your pennies all come up ordinary, you'll never look at your spare change quite the same way. Happy hunting.

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Gallery Credit: Lauren Wells