Before you toss that crumpled dollar into your pocket, take a closer look — it could be worth far more than you think. Collectors across the country are on the hunt for a rare misprint that’s turning ordinary $1 bills into treasures worth thousands.

What makes it special? It’s all about the serial number. A small printing error by the U.S. Bureau of Engraving and Printing in 2014 caused certain bills to share the exact same serial numbers — something that should never happen. Only a limited number were released into circulation, making them incredibly valuable today.

Experts say these rare bills came from two separate print runs — one in Washington, D.C. and another in Fort Worth, Texas. If you happen to find one of these duplicate-serial bills and pair it with its twin, the combined set could fetch anywhere from $10,000 to $15,000 among serious collectors.

To check yours, look for series 2013 notes bearing serial numbers between B00000001 and B00250000 or B03200001 and B09600000 — both featuring a small “B” on the left-hand side of the bill.

So next time you’re handed change, don’t overlook that dollar. It might just be one of the rarest pieces of currency still in circulation — and your ticket to a small fortune.