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Paper money collecting as a hobby

Banknote collecting, or notaphily, is a slowly growing area of numismatics. Although generally not as widespread as coin and stamp collecting, the hobby is slowly expanding. Prior to the 1990s, currency collecting was a relatively small adjunct to coin collecting, but currency auctions and greater public awareness of paper money have caused more interest in rare banknotes and consequently their increased value. The most valuable banknote is the $1000 bill issued in 1890 that was sold at an auction for $2,255,000.