Biography
:format(jpeg):mode_rgb():quality(90)/discogs-images/A-411375-1481357245-6942.jpeg.jpg) 
            Hammer
Effective period / Period of releases: 1970
Members: John Guerin, Norman Landsberg, John De Roberts, Richie McBride, Jack O'Brien
Psychedelic rock group from San Francisco, California, USA, early 1970s.:format(jpeg):mode_rgb():quality(90)/discogs-images/A-411375-1481357245-6942.jpeg.jpg) 
            Effective period / Period of releases: 1970
Members: John Guerin, Norman Landsberg, John De Roberts, Richie McBride, Jack O'Brien
Psychedelic rock group from San Francisco, California, USA, early 1970s.