1st I'll stay on topic..... the mustang definately seems NOT 100% original. The clear give away is indeed the tape/heat shrink over what could only be cut and resoldered wires. Let's say you're an installer or warranty repair tech at Fender in 1966..... you solder to stock wiring all day long. Why cut the main leads and the one pickup only to go thru the trouble to "neat it back up" with tape or heat shrink tubing, why not just solder to the jack and switches like they'd be doing all day long anyway? The question answers itself. That being said, like all things in life... Sh*t happens..... and pickups fail from time to time. Any novice with a soldering iron could do what i saw in the pictures. Now as to whether that repair was done last year or 1968, 1975 or whenever, maybe even under an offsite "fender service center", well that's entirely up to speculation. It's true that fender did let a lot of things slip out that just shouldn't be..... officially anyway, but it happened. But this one photo shows all the signs of POST factory repair. In the end, if you have a 66 mustang with one newer (whenever) pickup, and it plays, sounds, and looks great...... then 95% original is not bad..... not bad at all. Enjoy it for what it is.
2nd A little off topic.... but what is a transition Jag-Stang? The whole "MIJ" and "CIJ" was soley logistical semantics. From what I gather, FugiGen had it in their contract that any other guitars manufactured for Fender by another Japanese factory would NOT carry the "MADE IN JAPAN" stamp, to effectively set a divide between one Japanese companies product from another. Simply creating a "signature" for their units for easy mass market recognition without writing FujiGen on it. Once the production contract ended and Fender signed with another factory, legally they were still bound to relabelling the next phase of Japanese instruments. They could have labelled it "BUILT BY GODZILLA IN JAPAN", just as long as it didn't say "Made in Japan". One of the key components of the FujiGen contract was that they stop making the Tokai line, since that was a serious threat to Fender for years. That condition was officially loop holed recently, hence newer guitars carrying the Bold Stamp "Made In Japan" by the third official japanese factory. So my point would have to be..... What's a transition Jag-Stang? One manufacturer didn't give their remaining inventory of a discontinued line to another manufacturer who could potentially diminish their original product, especially in Japan. My boss was instrumental in bringing Yamaha to the U.S., and one thing that's clear from conversations, is the Japanese do not Fu*k around when it comes to respecting a company and/or product. So the concept of a "transition" Jag-Stang is lost on me. There's a MIJ and CIJ. No in between as far as i know. I could be wrong. Hell, Fender and Fender Japan aren't even the same companies technically, what does that tell ya!
3rd A little more off topic......The neck on Cobains Jaguar...... The neck itself is a Fender neck. Given that the guitar was heavily modified professionally, what stops a talented luthier who routed the body, cut a new control plate for the toggle and such, and then strung it for righty, from shaving down the CBS style arch to a strat size, slapping some varnish on it, and throwing a custom "aftermarket logo" on the head stock, as opposed to the neck being completely after market, or a headstock, which doesn't really fly. I've read on a few occasions that Kurt and Ernie would argue between it being a 65 or a 66, since the guitar had components of both years. And since the original pickups are gone, the only possible dates left on the guitar are the pots, neck plate and neck stamp. If the neck were entirely after market, then the ONLY dates left on the guitar would be the serial on the plate and the date codes on the pots, if even they were left original during the mod. I believe the neck was discussed in the KC Jaguar booklet where Fender states that the neck was indeed a Fender, but they can't absolutely explain the headstock.....
Then again.... I could be wrong on everything..... "TRUE KNOWLEGDE IS KNOWING THAT YOU KNOW NOTHING"