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.
A '90s classic with an '80s twist.
Ref. 6900 By John Mayer
G-Shock] John Mayer X Hodinkee : r/Watches
John Mayer debuts second limited-edition watch in new G-Shock, Hodinkee and Online Ceramics collab - The Manual
HODINKEE x John Mayer x G-SHOCK 6900-PT80
Introducing the G-SHOCK Ref. 5600 By Online Ceramics Limited Edition For Hodinkee
The Casio G-SHOCK Ref 6900 By John Mayer
New Hodinkee G-Shock collaboration with Ed Sheeran is inspired by his 'Subtract' album
John Mayer HODINKEE Collabo: Where to Find Casio G-SHOCK Watch Online
WTS] Casio G-Shock John Mayer x Hodinkee LE DW6900 - Full kit : r/Watchexchange
Online Ceramics and John Mayer release their special edition G-Shock Ref. 5600 - Acquire