For whatever reason, Roger Glover, the producer of the Razamanaz album, is reputed to have played all bass tacks on Razamanaz, including Vigilante Man. Glover, forever the gentleman, has never commented on this one way or the other, but neither have Nazareth denied it (perhaps they bargain on the extra sales to DP fans like me who cherish the Razamanaz album as a prime example of Rogers bass playing!). In any case, the fact that the studio version features a roundwound strung bass (as Glover preferred) and is played with a different feel, lends credibility to the story.
The most gloverish bass playing on Razamanaz is featured here - sounds like straight off Machine Head, typically idiosyncratic Glover timing and phrasing:
And which other Purple musician played on this track uncredited, class, intro at 0.10?
Come on, hear the similarity here at 4.11!!!
Needless to say, you also hear him here, intro at 0.22:
Dear Lord, that can't have been too hard even for you, can it?!!!!
But for the really, really slow and thick ones among you, I'll even supply a pic of him (far right) together with the brother of a Rolling Stone (far left), you can see some similarity in their Faces (nudge!).