I don't know what bass that is but I love GG; I have most of their albums and saw them in early 1975, opening for Rick Wakeman during his King Arthur tour where I saw the iconic (?) original triple neck Wal as played by Roger Newell (I was right at the front edge of the stage for the whole show in front of Roger!)
Of course, Ray was playing a P Bass; somewhere around here I have a bunch of 35mm slides of GG I made at the show.