Dave Grohl’s very own Gibson DG-335 signature guitar prototype has surfaced – and it has been listed on Reverb for $300,000. It was built in Gibson's Custom Shop in Nashville and featured heavily on stage and in the studio between 2005 and 2007. “This Prototype was played on Echoes, Silence, Patience, Grace as well as toured from 2005 until the first production guitars were delivered in 2007,” says Grohl’s then guitar tech. “This is the original, hand-made at the Nashville Gibson Custom Shop, prototype DG 335. “I started this project in 2001 after Dave expressed an interest in his own signature guitar.