Starting in 1908 when a sheet of notes is found not perfect, the entire sheet is replaced with a sheet with serial numbers that start or end with a star. Thus, you can have a pack of 100 notes with 001 on top and 100 on the bottom. A Our currency is printed in a process where the paper is slightly moist in order to receive the best ink impression. The moistness when dried leaves a wave in the paper.
Tours run quite frequently and are a lot of fun.
Whatever you want, but before you start spending big money take the time to buy the books that are written on your area of interest then make sure you read them. I do not push any certain grade or type of notes, but I do say that whatever do, don't buy notes with problems. A This is the association of collectors of paper money and six times a year they publish a wonderful magazine that teaches so much - well worth the dues. Send me your email with your address and I will send you an application. A Read the books, go to paper money shows, attend paper money auctions or read our website.