This article will hopefully help to put the best resources for fender serial number dating in one place.
& & The Vintage Guitar Price Guide is an amazing resource for Fender guitar and pretty much any popular manufacturer.
This article “Serial Number Identification and Decoding” article on Vintage & Rare’s website is probably one of the most complete resources of serial number information for Fender guitars and basses.
The Guitar Dater Project is a great quick and easy way to date a number of brands including Fender.
Willys Service Bulletin 53-5 explains "the effective serial numbers given apply to changes made in vehicles assembled at the Toledo plant and do not apply to those assembled in our west coast plant".