Truman on Nixon pinback button

Harry S. Truman commit about Richard Nixon pinback buttons although many list these buttons as 1968 or 1972 Anti Nixon pins I think they were made about 1974 or later when the book Plain Speaking: an oral biography of Harry S. Truman came out where he said "Nixon is a shifty-eyed goddamn liar and the people know it... He's one of the few in the history of this country to run for high office talking out of both sides of his mouth at the same time and lying out of both sides."
The 1st is about 2.250 Dia. the 2nd is 3.0