Just one challenge with dollars is that since all the denominations are printed on the same size notes, counterfeiters bleach very low value notes and reprint them as high value bills. In order that they take a $one bill, bleach it, then reprint it to be a $one hundred bill. https://garrettrclwy.howeweb.com/34545665/the-basic-principles-of-copyright-us-coins-for-sale