I couldn't find much out on their manufacturing process. From the website, looks like fender parts to me and just assembled and you cant buy parts for them. According to the FAQ on website.
My understanding is that the necks and bodies on Nash guitars and basses are licensed products from All Parts and Warmouth. The fit, finish and setup of instruments from Nash Guitars is superb.I bought a Fender American Original 60's Jazz brand new in 2018. Because one of the pickups crapped out on me after a year, I swapped them both out with SD Antiquity II's. I also swapped the wiring harness. And finally, I took out the copper ground strip and grounded the bass under the bridge (I didn't like the look of that copper strip). I love this bass.
I also own a Nash PB63 (with the jazz width neck) - That is also a great bass. Part of me wishes I looked into the Nash JB's instead of going with the Fender.
I would look at the Nash JB63 - And depending on your taste with the relic'ing process, you can choose how much relic you want. I'm not sure where Bill Nash sources his body and necks from, but they are fantastic.
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