Just In! This Martin OMJM John Mayer signature model acoustic guitar is a beauty! Definitely something you don’t want to sleep on! This is a the second time Martin collaborated with John Mayer to create a namesake guitar, this model simply being a slightly more affordable option to the OM-28JM version. Be sure to come down to your favorite pawn shop in Roanoke, VA and check us out to see this guitar in person!