Oh yes, fantastic sound that bass has...
In the Man of The World DVD, Peter Green himself talks about playing a six-string bass in the recording of Oh Well. I think he says he played all the instruments himself in the studio recording. He even "sings" the bit where it stands out in the recording.
This is the clip, and he says it around 7:53. By the way he is being interviewed by Mike Dodd, and the water behind him must be the famous swedish lake where to he retired to do some fishing....
http://www.youtube.com/watch?v=M_0-Y3r569s&NR=1
Ms Moose