...this has been through here before- Ralphe Armstrong: Bass of Doom Story
I have an early picture of Armstrong from a '70s Guitar Player
mag...if I remember, I'll re-visit it tonight. IIRC, it's a blonde? (it's a B&W photo) Jazz bass w/ a fretless P-neck.
More: In the mid-'70s, Fender had a fretless P-bass within their catalog.
I am not sure if a fretless Jazz neck was available (other than as a do-it-yourself).
So, at the time, Armstrong's Jazz body with a P-neck intrigued me...I also noted how his plucking hand was way back by the bridge pickup in the above mentioned photo.