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Refers to Albert Pick, author of the world paper money book on general issues. Nearly everyone who deals in world paper uses this system for identifying notes. Every note within a country has a number associated with it, often shown in the form "P-34" for general issues and "P-S34" for specialized issues (volume 1). Since every country has the same numbers, a note is identified by country and Pick number. For example, USA P-480 is your garden variety series 1988 1 dollar bill.
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