Need some guidance on a 1960 Fender Jazz Bass

My father, who just turned 79, worked for Fender in Fullerton back in the 60's. He was in the electronics R&D group. He got a 1960 Fender Jazz Bass and has had it ever since. He was under the impression it was a prototype, but with the dates on the neck and pots and the serial that seems unlikely. We do know it wasn't refinished, but the neck cavity/pocket is painted black (I attached a photo). Some think this is a sign of refinishing. I'm looking for information on other ways to identify/prove original vs. refin paint. Any and all opinions are welcome!
 

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If the story were true, there is no way that I would sell that bass.

I’d never be THAT hard up.

Oh, it's true and it's taken this long, for my MOM, to give it up! Dad had a lot of gear back in the day including amps and a 12 string electric. Pretty much all that remains is the bass. The story goes Mom didn't want to sell the 12 string electric, and when he did she put her foot down on selling the bass. Until now... :) The only other items that he has are some original blueprint schematics from assorted Fender amps and a Solid State Fender PA head.
 
My YOB bass. Had the chance to buy one at a good price many, many years ago but by the time I'd raised the cash it was sold elsewhere.

Looks authentic to me. A '61? Do you still have the felt mutes? I was going to point out that the grounding strip from bridge-plate to the rear pup cavity was missing but, no, it's there. I can never understand why Fender came up with the reissue one that's about ten times the width of the original.

Keep that baby in the family!
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