The Martin 00-42SC John Mayer signature acoustic guitar is actually inspired by the 00-45SC Martin created in collaboration with John Mayer in 2012. In fact, Martin's John Mayer signature models have been best sellers since the first one in 2003. This 00-42SC John Mayer brings you the classic 12-fret design and smaller body style that players adore, plus exquisite details like Style 42 inlays and grained ivoroid body and fretboard binding. Call Sweetwater today to add a very special Martin to your collection: the 00-42SC John Mayer acoustic guitar.