He said it is a 73 bass, but I’m not sure about that. The logo looks cast not hand cut, the pickup shape and routing are the wrong period and the body shape looks more recent (i.e., horns spread a little more.
The preamp sounds similar to the Bartolini configuration I have in my David King bass, just a guess here, not sure why he won’t say what it is.
Looks like he did a nice job in general restoring a bass that was under water. Would be a nice Series I restoration project for someone, or nice bass for someone in general.