Very few 1907 Rolled Gold Edge Eagle $10 coins have survived to the present, and collectors have engaged in frenzied bidding wars to get their hands on these elusive coins. Variety one is the low leaf version, which depicts an arched leaf jutting out sideways on the coin's reverse, while variety two is the high leaf version, which includes an additional leaf poking out of the cheese wheel that touches the corn husk leaf. Undis says currency auction houses are also good, especially for the more valuable notes, in comparison to eBay.

Dustin Johnston, head of currency for Heritage Auctions in Dallas, told the Boston Globe when the redesigned $100 bill comes out on Oct. In the 15 Types of Valuable Serial Numbers section above, you can see a complete list of potentially useful serial number types. If there are any, you can take your bank notes to them for an appraisal, and they will either order to purchase the note from you or direct you to someone who might be interested. Federal Reserve notes were issued between 1914 and the present in denominations ranging from $1 to $10,000. On $1 and $2 bills, the letter preceding the serial number will match the bank where the bill was issued, and the number portion of this identifier appears separately on the currency.

Knowing what your paper money is worth is all in the serial number. Your money may be worth more than you think.

$2 dollar bill serial number lookup