Bass direct have got a 78 P in, it says the nut is 44mm , I’ve never seen this on a 78 or maybe a miss measure
https://www.bassdirect.co.uk/product/fender-precision-bass-white-1978-pre-owned/
I remember it being there and I don’t think 6k was a bad price for the year, I was kinda tempted to go and have a look but I’m not really into refinishes, and I think it was quite a distance from me
Talking of maple fingerboards recently, Andy Baxter has just put up a lovely 72 P, great condition
https://www.andybaxterbass.com/products/1972-fender-precision-bass-sunburst-2
The ones I like are the sunburst maple with the black blocks, the Aston Barrett style, a friend of mine sold their one a while back and didn’t even tell me
the pf50 through the same cab the big baby ll can go fairly loud but I’d say the v4 is much louder, it has a different sound though, a bit hard to explain, the eq works really well and you can get a nice warm tone, great with a precision