This is considered an Obsolete banknote which were issued in the era before there was US government issued currency. Obsoletes were printed by private companies.
On your note, the company that designed and printed it is found in the upper right above the oval numeral.
I do not know much about grading of these notes. Here's one that the seller grades as Very Good http://www.aocurrency.com/images/im...G-1019-G.jpg
As to value, again I'm no expert but the one I linked to above is listed for sale at $150. Whether or not it will sell remains to be seen.
Welcome to the forum.
I'm slowly building my numismatic library--106 works and counting
With assistance, trying to compile a listing of numismatic reference books & materials available to collectors http://goccf.com/t/174749