On $1 and $2 bills, you’ll find a left-hand seal with the name of the regional Federal Reserve bank that distributed it. On other denominations, there is a letter-number combo that represents ...

On older series notes, as well as $1 and $2 notes, you’ll find the District letter within a regional Federal Reserve seal. A new note becomes legal tender when issued by a Reserve Bank. Which Bank ...

The thread, which sat next to the Federal Reserve seal, was only visible if you held the bill up to the light, at which point, if you squinted, you could make out the phrase “Freemasons Rule.” ...