One dollar. It's not a US Treasury issue. Someone took a real Washington bill and pasted JFK's picture on the front of it. They're sold as novelty items and "commemoratives" but have no real interest...
It's an ordinary Washington bill that was altered to commemorate JFK after he was assassinated in that year. Unfortunately it's not of interest to coin or bill collectors, though there may still be...
This info is for current issues: $1: Obverse: George Washington Reverse: Great seal of The united states $2: Thomas Jefferson, signing of the Declaration of Independence $5: Abraham Lincoln, Lincoln...