Re: MIJ strats
I have a '92 MIJ Strat in my collection, and I couldn't audibly tell it from a MIM or US. Though, the picguard screw positions are different, and it's bridge chroming seems to be waring quicker, but it was my first! I have changed the pickups to EMG and the tuners are now Sperzel Locking.
It was the first of my guitars to get a mod's makeover, and its tone sprung to life with the EMG's and the Sperzels keep it in tune much better.
If you want to trace your guitars past, you can on Fender's site.