On occasion, a bill shows up that has a small star in place of the final letter in the serial, and many early issues carried the star in front of the serial number. Altogether, there are a possible 2,499,999,975 serial numbers for each bank! The final letter is used to raise the number of possible bills beyond 99,999,999.Using these digits alone, there would be a possible 99,999,999 bills issued per bank. This number increases sequentially as each bill is printed. The eight numerical digits that follow represent a unique ID number.As there are 12 Federal Reserve Banks, this letter can range from A to L, with A representing Boston and L representing San Francisco. The second letter (or first, if you're looking at an old-style bill) represents the district of the Federal Reserve Bank that your bill was issued from.You can also find the series of the bill printed directly to the bottom-right of the portrait. This begins with A, and moves through the alphabet each time a new series is needed (for example, each time there is a new secretary of the treasury, the bill design changes because the secretary's signature is on all currency). Those bills (and all produced since then) have an 11-digit serial. Ten-digit serial numbers were on all bills until the 'new style' came out in 1996. ![]() The series indicates the year in which the design of the bill was approved for production. All modern United States currency contains either a 10- or 11-digit serial number in order to make each bill unique.
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