2004 Martin OM-28JM limited signature edition. It's John Mayer's first Martin signature guitar. In an Instagram Story where he shared his appreciation for Martin acoustic guitars and [showed a few from his own collection](https://images.equipboard.com/uploads/source/image/71776/ogj9BO6.jpg), he writes this about the OM-28 JM: > This is the one, though. OM-28 JM Signature. Been with me since 2003. He shared [another image](https://images.equipboard.com/uploads/source/image/71777/9HUtvB0.jpg) of it and continues to say: > And will be for life.more
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