A friend of mine in London is selling his Two-Rock John Mayer Signature Head.
It's not from the run of 25, but one of the post-production NOS models Bill built (with JM's signature on still.) It's the red suede one that popped up in 2014.
Absolutely fantastic amplifier. These DO NOT come up for sale anymore, ever, so if you are a serious collector who's dreamed of one of these heads, I'd jump on this now. I've already had interest on Instagram. You do literally have to do whatever it takes when these come up... when mine came up, I sold a load of gear, my OMJM, Road King II head etc, took out a loan and used all of what I had saved at the point. I don't regret it!
Genuine reason for sale. Willing to ship worldwide. PM me for info and I can put you in touch. I have a few photos but I don't know how to get them from Instagram PM's haha!