John Mayer’s 2004 Fender Stratocaster Custom Shop (John Mayer Artist Series Prototype)
This guitar was first seen sometime in July during the 2004 Summer Tour [John Mayer at Shoreline Amphitheater July 16, 2004]. Based on a few sources, it is highly likely that this guitar was a prototype of sorts for John’s upcoming Artist series from Fender, which became publicly available a year later, in July 2005.
According to the information over at Fender Reissue Shop website, John received two prototypes with serial numbers JM001 and JM002 in 2004. Both of these were custom built by Chris Fleming and were used by John during the 2004 and 2005 tour. Sometime in 2005, he gave the JM002 back to Chris Fleming as a present, and after changing a couple of hands the guitar ended up with guys over at the Fender Reissue Shop [Fender Masterbuilt John Mayer Prototype Stratocaster Stage Played JM002 Proto]
The guitar is heavily based on the Stevie Ray Vaughan tribute model on which John relied for most of his career up until that point. The main difference is the orientation of the bridge, which was rotated 180 degrees back to its original position, and the pickups which were replaced with a set of single-coils designed with John’s personal input. These pickups eventually became known as “Big Dippers”, and were available exclusively through John’s Signature guitars – meaning you couldn’t buy them separately.
As said, most of the other stuff was pretty standard and was taken either from vintage models (general design) or Stevies Ray Vaughan Signature model. The guitar featured alder body, thick C shape neck with African rosewood fretboard featuring 9.5” radius and 6105 narrow jumbo frets, and 25.5” scale length. For more in-depth details consults official Fender spec sheet – [John Mayer Signature Models Specs].
The John Mayer Signature model was discontinued in September 2014, shortly before John announced that he’s parting ways with Fender, although he obviously he still continued using Fender guitars but was no longer endorsing the company.