Here are some general guidelines for valuing old $1 bills:
* Rarity: The rarest $1 bills are those that were printed before 1869. These bills are known as "large notes" and they are highly sought after by collectors. Some of the rarest large notes include the 1861 $1 bill with a red seal, the 1862 $1 bill with a green seal, and the 1863 $1 bill with a blue seal.
* Condition: The condition of an old $1 bill is also important. Bills that are in good condition, with no tears, stains, or damage, are worth more than bills that are worn or damaged.
* Historical significance: Some old $1 bills have historical significance that can increase their value. For example, bills that were printed during the Civil War or World War II can be worth more than bills that were printed during other periods.
If you have an old $1 bill and you're not sure how much it's worth, you can take it to a coin dealer or an appraiser for an evaluation.
Here are some specific examples of the values of old $1 bills:
* A 1861 $1 bill with a red seal in good condition can be worth up to $1,500.
* A 1862 $1 bill with a green seal in good condition can be worth up to $1,800.
* A 1863 $1 bill with a blue seal in good condition can be worth up to $2,000.
* A 1928 $1 bill with a star note (a bill with a serial number that begins with a star) can be worth up to $500.
* A 1934 $1 bill with a "Hawaii overprint" (a bill that was overprinted with the word "Hawaii" during World War II) can be worth up to $500.