Although a serial number is helpful for roughly determining the age of a guitar, this is often not the exact date. As a result of the overlap between years, Fender serial numbers are also not by definition chronological.
In the past (we are talking about before 1976) the serial numbers were often randomly assigned.
To approximate the correct year of construction before this period (1976) is to also check the dates on the heel of the neck and of the potmeters. Usually the production date is stamped or written on the heel of the neck. To read this it is necessary to unscrew the neck from the body.

Most specifications for the Fender guitars are hardly changed. Although there have been periods in which major changes occurred as the acquisition of Fender by CBS, and the transition from CBS Fender to the current owner (Fender Musical Instruments Corporation), most models are in general not changed.
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The Fender Stratocaster is a model of electric guitar designed from 1952 into 1954 by Leo. After mid-1954, the four-digit serial number was stamped into the steel heel plate. As of 2019, these include the more affordable American Performer Stratocaster (successor to the Highway One and American Special. The serial numbers do not reflect this change - Fender continued to make instruments using existing serial number schemes. The new Fender did not acquire any physical assets of the old company, just the name 'Fender'. Hence during 1985 to 1987, production of Fender guitars was only done in Japan, while USA Fender created a new factory in.

Key performance indicators car rental industry. At the Stratocasters from the early fifties the serial numbers were stamped on the back vibrato cover. On some Telecasters at the bridge between the pickup and the saddles.