John Mayer’s National Style-O Resonator 12-string
John used this guitar on the 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).
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.