This must have been heavily played looking at the neck wear, nice bass
https://reverb.com/uk/item/79902368-fender-precision-1966-blonde-slab-ex-the-who-john-entwhistle
I’ve had custom shop fenders and they are amazing instruments, don’t know where you get the badly bolted together bit, they have gone up in price considerably and I wouldn’t now pay 5k for one, I’d rather go vintage for that money