The Strat's comfortable contoured edges and in-built vibrato system led to its soaring popularity.
While Fender was not the first to manufacture electric guitars — luthiers and larger musical instrument manufacturers had produced electric guitars since the late 1920s — the popularity of Fender's instruments superseded what had come before.
Fender Musical Instruments Corporation (FMIC), commonly referred to simply as Fender, is an American manufacturer of stringed instruments and amplifiers.
It is famous for its solid-body electric guitars and bass guitars, such as the Stratocaster (also known as the "Strat"), Telecaster (also known as the "Tele"), Precision Bass (also known as the "P-Bass"), and the Jazz Bass (also known as the "J-Bass"). The company, previously named the Fender Electric Instrument Manufacturing Company, was founded in Fullerton, California, by Clarence Leonidas "Leo" Fender in 1946.
So, as for your dilemma; for all intents and purposes, if you find those markings on your parts...it's probably legit and original.
I've looked at a number of sites, but I can't find a year of manufacture for a Fender Stratocaster made in Mexico with a serial number that begins with MZ.
The Japanese-made Fenders do have some slight serial number differences (typically a "J" serial number prefix). I believe this was a mistake on Fender's part using the same prefix for both U. Below are some examples of letter prefixes used in recent serial number schemes.
Japanese Serial Numbers on Peghead Decal Note the lack of S, E, N series.
If you pull the neck off of a MIM Strat you'll probably find a date stamp on the end of the neck (the portion that rests in the pocket).
In 1954, Fender unveiled the Stratocaster ("Strat") guitar.
With the Telecaster and Precision Bass on the market for some time, Leo Fender was able to incorporate input from working musicians into the Stratocaster's design.
The company is a privately held corporation with Andy Mooney serving as the Chief Executive Officer.
The company filed for an initial public offering in March 2012, The company also manufactures acoustic guitars, electric basses, mandolins, banjos, and electric violins, as well as guitar amplifiers, bass amplifiers, and PA (public address) equipment.