John Mayer Designs Casio G-SHOCK Ref 6900 Watch Inspired by His Childhood Keyboard,John Mayer G-SHOCK 6900 PT1 Hodinkee DW6900JM22-2CR UNBOXING, ON THE WRIST, ALL DETAILS 4K,Ref. 6900-PT1 By John Mayer – HODINKEE Shop,The G-SHOCK Ref. 6900-PT1 By John Mayer | HODINKEE