Replacement Banknotes

The process of printing sheets of banknotes is very high speed process and errors do occur, especially at the stage when the sheets are guillotined into individual notes. Any unusable prints are destroyed and a replacement, printed on another machine & with a different serial number, is substituted. These replacement notes usually have specially identifiable serial numbers and are very collectable……things like an asterisk before the number, or the letter M, or as in this Scottish example a ZZ prefix.