Casio G-SHOCK Ref. 6900 by John Mayer | HODINKEE,G-Shock x Hodinkee John Mayer Ref. 6900-PT1,John Mayer Designs Casio G-SHOCK Ref 6900 Watch Inspired by His Childhood Keyboard,A third and final John Mayer x Hodinkee x G-Shock collaboration (DW6900JM22-2 ) is launching today (December 13) - G-Central G-Shock Fan Site,John Mayer Designs New Casio G-SHOCK Ref 6900 Watch