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The Musicmasters, early and late, are those both Fender branded, and what years would you say that they are ?
Yup! Both Fenders. They changed it a little and the earlier ones (early 70s) had "tulip tuners," the transition logo, and a slightly different pickguard that didn't "wrap around" the neck heel. The later ones (they were made until 81 I think) have the "70s" logo and more familiar tuners.
Was the early MM separate neck originally on the early MM body, and if so, was the swap simply a matter of undoing the neck bolts, changing the neck, putting the bolts back, and checking the setup ?
Yeah. I got it in the early 2000s but it was in pretty bad shape. This year I got the body refinished but instead of putting the neck on, I got one of the later necks (I preferred the more standard tuners and 70s logo and by the time I got my early MM necks, they didn't have the original hardware anyway). It's funny, until now I always thought the nut width on the later 70s neck was wider, but measuring for you, I see that's not the case. It might just feel that way because of the gloss finish or the neck shape, I'm not sure.
Is the Squier MM one of the Vista series from around 1997 ?
EDIT : 2nd glance shows that the Squier MM neck is slightly wider, at both the pocket and the nut, so it may or may not be swapable with the other 3, which look to be identical in width as a group.
Yes, my first bass! I actually have two of the early Fender necks, one of which I had on this bass for a while. So I can say for certain that the Squier's pocket is definitely wider than the Fender's. It wasn't a big issue, but there was some space on the right side of the neck.
At first glance, it looks to me like any of these necks and bodies could be swapped if you had a reason to do it.
Is that also your feeling ?
Yeah, with the caveat about the Squier pocket I mentioned. I've never had the neck off the Mustang, but I don't think it would be an issue.
