Forgive me, 2nd or 3rd post comment on this threard.
James Jamerson's The Funk Machine was simply a stock 1962 P Bass. It was stolen. Never found. Thus, impossible to duplicate.
The closest we can get to his bass would be to buy a pre-CBS 1962 P Bass. Who of us have that kind of money?
Probably, the 2nd closest we could get to his bass would be to buy a Fender Custom Shop 1962 P Bass. "Who of us have that kind of money?"
Otherwise, IMHO, this signature thing for JJ's P Bass is lame! Just a sales ploy for "you know who".
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