Make an exertion to keep in mind where you obtained the bill, as this facts might help notice down copyright sources. But the counterfeiters go on to build improbable examples like this “P” (no mint mark) 1877 with the usually widespread reverse: You can also obtain copyright detector pens online https://lloyds580wsn8.laowaiblog.com/33306646/an-unbiased-view-of-how-to-check-copyright