What are some examples of rare $1 bills?

Some examples of rare $1 bills are the 1862 $1 banknote and the 1875 $1 banknote. The 1862 note, which comes in four varieties, was signed by Chittenden and Spinner, and the 1875 $1 note was the first note printed and backed by the United States.

The 1862 $1 notes were only printed in a series that went up to 99,999, so it is not unusual to find low serial numbers, making this particular series of notes both rare and valuable. The most valuable and rare 1875 notes come in a series of A to E, with C being the most common and D the most rare and valuable.