If you have any old $2 bills lying around, it could be your lucky day!

According to the US Currency Auctions' Pricing guide, depending on certain factors, a $2 bill could be worth a lot more, even up to $5,000.

The US Currency Auctions estimates in their guide that uncirculated $2 bills from before 1917 could fetch more than $1,000.

The guide notes that uncirculated bills from 1890, featuring a red seal, could be worth upwards of $4,000.

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According to Heritage Auctions, the largest auction house in the world that deals with currency, a $2 bill from 2003 with a low serial number recently sold at auction for $2,500.

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Art Pinto, the manager of Legacy Coins and Curiosities in Lutz, Florida, said that there are a number of contributing factors that help indicate the value of a $2 bill.

Newer bills have a green seal and is likely worth face value, Pinto told FOX 13. If the bill has a red seal, it is likely older, and the value generally starts to increase.

"If you're looking for a high dollar $2 bill, it would be pre-1900, and it would have to be in a very high condition graded condition," said Pinto. 

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The U.S. Currency Education Program says that as of 2017, there were 1.2 billion $2 bills in circulation, with a face value of $2.4 billion.