A replacement banknote is a banknote that is printed to replace a faulty one and is used as a control mechanism for governments or monetary authorities to know the exact number of banknotes being printed. As quality control finds defective notes in the printing process after the serial number has been overprinted, they are taken out with their serial number written down and replaced with another banknote printed specifically for this purpose, so that the amount of banknote being printed stays the same in each production batch. This saves time and money compared to re-printing exactly the same serial number that was used before. It is rare that the replacement banknote has the same serial number as the original faulty one. A replacement note will have its own serial numbering system that separates it from the normal numbering system.

My reference book was released at Long Beach: 592 colored pages covering the replacement notes for most countries. The book received great feedback from many collectors, dealers, auctioneers and graders. The Book is sold for $65 plus shipping.