While the new Casio G-SHOCK Ref. 6900-PT80 by John Mayer has sold out, you can still find similar watches and dupes available to buy online.
Casio G-Shock x John Mayer x Hodinkee DW6900JM21-7CR 50mm in Resin - US
John Mayer Unveils First-Ever Watch Collaboration with G-Shock
G-SHOCK x Online Ceramics model
DW6900ESC239 - Ed Sheeran Collaboration Model
Casio G-SHOCK Ref. 6900 by John Mayer
John Mayer Designed Another Casio G-Shock Watch with Hodinkee
in Hand Casio G-shock Ref. 6900 Wrist Watch by John Mayer X Hodinkee for sale online
John Mayer and Hodinkee Have Created a Special G-Shock Watch
Casio G-SHOCK Ref. 6900 by John Mayer
Hodinkee x G SHOCK x John Mayer x Ed Sheeran
Casio G-SHOCK Ref. 6900 by John Mayer
DW6900JM22 - John Mayer Collaboration Model
A '90s classic with an '80s twist.
Ref. 6900 By John Mayer
John Mayer, G-Shock, and Hodinkee Watch Collab Sells Out in Just Minutes… Again - The Manual