It's 44mm at the nut, 7.25 radius I think, and front to back it's a very comfy rounded D shape. Not super slim and flat like some reissues can be, and not chunky either.
For me at least it is the perfect fit. I pretty much don't notice the neck on this bass. it's always allowed me to just play. Very user friendly if you know what I mean.
I didn't actually know it had a full width neck until yesterday actually! Another Basschatter asked me to measure it. I'd always assumed it was a B width neck because it's so easy to play and also because I had a mij '62 P with a wide neck once and found that a bit of a chore to get around on.
I don't have any photos with the covers off sorry, really should have taken some..
I've packed it up now ready to go - please don't make me look at it again, we've said our goodbyes already! 😥