This is a United States Note, not a Federal Reserve Note.
This note was issued by the US Treasury during John F Kennedy's presidency as real money, not a debt to the Federal Reserve.
As you read your way through this website the significance of this will become clearer and clearer.
This not an amusing curiosity. It is tangible evidence that there is another way to issue money!
Read the article: How the One Dollar Coin Can Cure the Economy on the articles page