From 1863 to 1935, National Bank Notes were issued in many denominations by thousands of banks throughout the country and in U.S. territories during three charter periods. As of January 1, 1929, there were more than 7,600 National banks in existence. The chartering of banks and administrative control over the issuance of National Bank Notes were the responsibility of the Office of the Comptroller of the Currency.
National Bank Notes are still redeemable by the Department of the Treasury at their face amount only; however, they may have added value in the numismatic market. The Bureau of Engraving and Printing, as part of the Department of the Treasury, does not appraise or estimate numismatic values. It is suggested that you contact several dealers in old or rare currencies for an opinion. Dealers' names are likely to be found online. You may also refer to numismatic publications which contain pictures of the various notes and list suggested prices.