In case anyone's interested, Chris told me this about his Elektra a couple of years ago:
'It¹s a bass that was a favourite of mine made for me in the 70s by I guess
what¹s now some (Westone/St Louis Music) music company which I guess makes
Ampeg and they made Alvarez guitars the acoustics which was one of those
lines. But they were also experimenting with electric guitars and this was a
custom made bass which they made for me that actually has effects modules
that you pop, into the back of the bass, there¹s a little flap. And although
I don¹t always use the effects the guitar is one of those very playable
basses which I enjoy playing and has a great sound. I¹ve always had it in my
arsenal, as it were.'