John Mayer’s National Resonator 12-string
John used this guitar on rare occasions when playing the song Walt Grace’s Submarine Test, January 1967 live (something he initially avoided doing but does more often in recent years).
Here is one guitar that never did anything else but the song it was written on. I think it’s a baritone.John Mayer Soundcheck Live On Instagram July 19,2017
This National seems to be a custom-made guitar since it looks to be fairly new, and features a 12-string neck – which seems to be very rare on these guitars. Next to that, the guitar is also equipped with a sound system, which is obviously not something you’ll find on a true vintage Style-O. Beyond this, not much is known about the guitar at this moment.
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Not sure where I saw this but I’ve seen him talk about this guitar. He bought it in Japan. He said that when he picked it up he just started playing the opening riff to Walt Grace.