Middleweight boxing champions from the 1960's?

Here is a list of lightweight boxing champions during the 80's:

Jim Watt

Ernesto Espana

Alexis Arguello

Hilmer Kenty

Sean O'Grady

Claude Noel

Arturo Frias

Ray Mancini

Edwin Rosario

Livingstone Bramble

Jose Luis Ramirez

Hector Camacho

Edwin Rosario

Jose Luis Ramirez

Julio Cesar Chavez

Pernell Whitake

Edwin Rosario

See the related links for more information.