Casio G-SHOCK John Mayer X Hodinkee (Ref. 6900-PT80) | eBay,John Mayer teams up with CASIO G-SHOCK to release a signature watch,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,The G-SHOCK Ref. 6900-PT1 By John Mayer | HODINKEE,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,