G-SHOCK Ref. 6900 By John Mayer – HODINKEE Shop,Leave It to John Mayer to Design the Hottest Watch Collab of,John Mayer designs Casio G-SHOCK Ref 6900 watch,Ref. 6900-PT1 By John Mayer – HODINKEE Shop,John Mayer HODINKEE Collabo: Where to Find Casio G-SHOCK