Martin Guitar - Martin OM-28JM 'John Mayer' https://www.martinguitar.com/guitars/custom-signature-editions/omjm-john-mayer/ 📷: @johnmayer | Facebook
John Mayer on Instagram: "When @martinguitar and I first developed the OM28- JM back in 2003, I could never have imagined the relationship would span 20 years, so when the idea for a
![Martin Custom Shop OM Size 28 Style with Engelmann Spruce Top, Abalone Rosette and Fishman Pickup - Maury's Music Martin Custom Shop OM Size 28 Style with Engelmann Spruce Top, Abalone Rosette and Fishman Pickup - Maury's Music](https://i.b5z.net/i/u/1530927/i/OMJM-John-Mayer_x.jpg)