Also-J.Lynch, Am.Heros MS66-
Jaime Hernandez: The 2004-D Jefferson Nickel received a new reverse design this year. From 1938 - 2003 the Jefferson Nickel carried the same basic Thomas Jefferson obverse along with the Monticello Building reverse.
In 2004 the obverse remained the same and the reverse was changed to a Peace Medal design. The 2004-D Peace Medal design is a one year type as the reverse was changed again during the year, but this time to a Keel Boat design. Both the Pace Medal and Keel Boat reverse designs were only used in 2004.
The 2004-D keel Boat nickel is common in circulated grades up to M66 condition. In MS67 condition they become very tough to locate from circulation and most example probably in this grade or higher probably came from original wrapped rolls. In MS68, it is very scarce with none existing in higher condition.