Here are some factors that can affect the value of an uncirculated US $1 bill:
* Condition: The condition of the bill is one of the most important factors that determines its value. An uncirculated bill is a bill that has never been circulated and is in perfect condition. This means that it has no creases, folds, tears, or stains.
* Rarity: The rarity of the bill is also a very important factor that determines its value. Some uncirculated $1 bills are more rare than others. For example, a $1 bill from 1934 is more rare than a $1 bill from 2000.
* Series: The series of the bill also affects its value. Some series of $1 bills are more rare than others. For example, a $1 bill from the 1934 series is more rare than a $1 bill from the 1957 series.
* Signature: The signature of the Treasury Secretary and Federal Reserve Chairman on the bill can also affect its value. Some signatures are more rare than others. For example, a $1 bill signed by President Franklin D. Roosevelt is more rare than a $1 bill signed by President John F. Kennedy.
If you have an uncirculated US $1 bill, you can check its value by looking it up in a coin and paper money catalog. You can also take it to a coin dealer or paper money dealer to have it appraised.