I have an 1988 100 in uncirculated condition but in the back top left corner it is stamped CBO from what I researched it stands for Congressional Budgeting Office anyone know of these
Try the currency forum, you'll have better luck there
Wherever you post it, you'll need photos.
If it is small it is likely a merchant or money changer's stamp, indicating their check for authenticity.
CBO could stand for anything.
@yomommaAho ... Welcome aboard. This is the coin forum, try the currency forum. Come back if you also collect coins. Cheers, RickO
Just a damaged note. Value is $100. Who knows what the "CBO" stands for ... or cares?
Once a note leaves the BEP, anyone can stamp or write anything they want on the note. Usually, it is considered to be damage. Bills with the autographs of famous people can add value to the note and are quite collectable.
Worry is the interest you pay on a debt you may not owe.