USA Squiers: USA Squires are very rare and usually have a E serial number and were made for less than a year spanning 19.Korean Squiers: C refers to Cort, V refers to Saehan(Sunghan), S was already taken by Samick so Saehan(Sunghan) used V instead (Saehan(Sunghan) made the Vester guitars). The second character refers to the decade: N represents Nineties (1990's). So, for example "CN6" = made by Cort in 1996 and "VN6" = made by Saehan(Sunghan) in 1996.
Most notably, PRODUCTION DATES have been penciled or stamped on the butt end of the heel of the neck of most guitars and basses, although there were periods when this was not consistently done (1973 to 1981, for example) or simply omitted.
SERIAL NUMBERS were stamped on the back vibrato cover plate on early ’50s Stratocaster® guitars, and on the bridge plate between the pickup and the saddles on some Telecaster® guitars.
In March 1985, CBS sold Fender to a group of private investors.
Most specifications for a given Fender instrument model change little (if at all) throughout the lifetime of the model.
While there have been periods of dramatic change—such as the transition periods between the Leo Fender years and the CBS years or the transition between the CBS years and the current ownership—most models are generally feature-specific and do not change from year to year.
SERIAL NUMBERS are also helpful in determining an instrument’s production year.