ries of U.S. $1 Federal Reserve Notes issued in 1963, particularly notable for bearing the signature of Joseph W. Barr, who served as Secretary of the Treasury for a brief period (28 days). His short tenure led to the notes being relatively scarce and highly sought after by collectors. 

Key Features of Barr Notes:

• Signature:

• They feature the signature of Joseph W. Barr, who was the Secretary of the Treasury during the latter part of President Lyndon B. Johnson's administration. 

• Series:

• They belong to the 1963 series of Federal Reserve Notes. 

• Design:

• They feature the portrait of George Washington on the face, which has been the standard on $1 bills since that time. 

• Scarcity:

• Due to Barr's short tenure, notes with his signature are considered relatively rare and sought after by collectors. 

• Issuing Districts:

• Barr Notes were only issued from five of the twelve Federal Reserve districts: New York, Richmond, Chicago, Kansas City, and San Francisco. 

Why They are Collectible:

• Short Tenure:

• Barr's short time as Secretary of the Treasury, just 28 days, means there are fewer notes with his signature in circulation, making them more valuable. 

• Historical Significance:

• They represent a specific period in US currency history and a brief change in leadership at the Treasury. 

• Design:

• The 1963 series was the first to feature George Washington's portrait on all $1 bills, a design that remains standard.