I am trying to referance Geezer Butlers tone on the "Black Sabbath" and "Paranoid" albums. I know he was using a (stock to my knowledge) Fender P-Bass at the time. The tone on the song "Hand of doom" is something I'd like to get at least close to.
It depends on the finish. Solid finish Fender basses of that period were mostly alder. The natural and sunburst finishes were ash.
Tone is not only in the wood but how a player plays tha bass. Geezer played very agressivly & near/on top of the neck. Good luck.