Re: Don't solder like this.
Even with a perfect, as original soldering job, there'll be no way an educated and experienced collector won't know it has been re-done.
Probably not that critical on that particular bass anyhow, though. It's not like it's a near mint slab board P or sumthin' like that. Looks to me like a post -'67 that has already been screwed with.
P.S. I just looked up the pot code, and it's '74.
Here are a few pix I found online (all from the same harness). It sold for only $155. This is the best route for the owner to take, if they really want to restore the bass as well as possible.
And some pix from a very clean '74:
As you can see, they didn't use a ground wire to the jack. They used the aluminum foil under to guard to serve as a ground connection between all pot chassis and the jack ground. Same with old aluminum guard Ps from the '50s, and '60s Ps with the full sized aluminum plate under the guard. But sometimes you see factory ground wires anyhow, usually with cloth insulation.