@berlihe -
Definitely a Gibson RD bass:
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A child of Maritime stock on both sides of his family, Stan Rogers was born in Hamilton, Ont. on November 29, 1949. He grew to be a big man-six feet four-bui...
citizenfreak.com
An RD Artist bass, specifically: it had the headstock decoration thingy, plus, in the pic I copypasted here, one can see the faint shine of one switch behind the bridge and of the output jack. Both the switch and the heastock inlay were present on the Artist
A detailed look at the RD Artist bass: pictures, description, schematics, original publicity and sound clips of Gibson's first electric bass, with inbuilt Moog electronics
www.flyguitars.com
but not on the
RD Standard bass, which also had a control knob at that jack socket location, and the latter at a different spot.
See above. However, there does seem to be something round and clear stuck to the upper non-horn (bout?), where a Les Paul pickup selector would be.
Did he have one added up there? If I had one I'd leave the electronics well enough alone, but who knows?
Or is it an adhesive pick holder, perhaps? Were those already a thing, back then?
On related news, what was Jim Morison playing here?
Something native maybe? possibly a Lado?
https://www.talkbass.com/threads/join-the-lado-club-post-yours.728809/
https://www.talkbass.com/threads/show-your-lado-basses.322960/