Serial numbers are also helpful in determining an instrument's production year. For years, serial numbers have been used in various locations on Fender instruments, such as the top of the neck plate, the front or back of the headstock and the back of the neck near the junction with the body. 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.
But once again, due to Fender's modular production methods and often non-sequential serial numbering (usually overlapping two to four years from the early days of Fender to the mid-1980s), dating by serial number is not always precisely definitive.