Find a buyer: You can sell your $2 bill through online marketplaces like eBay or you can visit a coin and currency dealer.

Rare 2-Dollar Bill How to Spot It 1928B $2 Red Seal Star Notes Look at the serial number. If it starts with a star and ends with a B, it's rare. 1890 Treasury Note 2-Dollar Bill Check the portrait.

Here are some $2 bills for which to keep your eyes peeled ... especially with the red seal color, can fetch anywhere from $4 to $175. This series is not as rare as the 1928 series but still ...