In case you’re during the U.S., all real bills can have a watermark of the individual whose portrait is over the bill. They’ll even have a safety thread embedded during the paper that glows under ultraviolet light-weight. Some trade dollar fakes have an used rim- they struck the coin 'disc' https://onlinepharmacynearme95006.idblogmaker.com/33650045/facts-about-where-can-i-copyright-dollar-bills-revealed