Here are some factors that can affect the value of a 1934a $20 bill:
* Condition: The condition of the note is one of the most important factors in determining its value. A note that is in excellent condition, with no tears, folds, or other damage, will be worth more than a note that is in poor condition.
* Serial number: Certain serial numbers can make a note more valuable. For example, notes with low serial numbers, such as 0000001, are often more valuable than notes with higher serial numbers.
* Star notes: Star notes are notes that have a star (*) in front of their serial number. Star notes are considered to be rare and are often more valuable than regular notes.
* Signature combinations: The combination of signatures on a note can also affect its value. For example, notes signed by a combination of signers that is rare or unusual can be worth more than notes signed by more common combinations of signatures.
If you have a 1934a $20 bill with the green seal, it is important to have it professionally appraised to determine its exact value.