The John Mayer Signature head is the most sort after amplifier that Two Rock built in the early years of the company's trail blazing run. Limited to only 25 amplifiers this is the last of the run - Serial Number 25. I sold this amplifier new to one of Two Rock's best client and we requested the last amplifier of the run. As a personal favor Bill Krinard went over the build and tweaked this Mayer himself before it was sent out to us. This is a rare chance to acquire this amplifier as we're only putting this up for a limited time before it goes into the Watchtower amplifier collection. The amp is mint and ships in its original Mayer flight case. If you have any questions please let us know. I'll also be listing several rare limited Two Rock's from this collection including a Sterling Signature, Kimock Signature, and the very first Overdrive Signature that was built by Bill Krinard himself. To the buyer who hits the buy it now price on this Mayer amplifier I have a rare and special treat - a limited matching carbon fiber Sinewave 2x12 cabinet loaded with Two Rock speakers that was commissioned for this build. There's not another Mayer with that cabinet. Please let us know if you have any questions.