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The only way to really determine the value of a note is to have a reasonably qualified person look at the note. Sometimes a collector will send a photocopy of both sides of a note for identification rather than the note itself. If you want a best effort, members of rec.collecting.coins can almost always identify a note, given enough information about it. See the "I found a note from country XYZZY" section for what information to include about the note.
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