Unusual notes are those a layperson thinks are not valuable, but are in fact invaluable. There are three types of unusual notes: specimen, error, and uncut notes. Upon encountering such notes, the layperson’s first instinct may be to quickly use them or exchange them away for fear they may be worthless, damaged or fake. But that will be an expensive mistake—one I had unfortunately made myself—as these notes are among the most coveted in the collector’s market.