Why do some of the used instruments from MIRC have a “used” stamp on the back of the headstock?

This step is a long-standing agreement we have had with some of our manufacturing partners taken to protect their interests and to prevent the filing of improper warranty claims.  For many consumers, the “used” stamp is recognized as a sign of quality, giving confidence that an instrument originating from MIRC has been properly set-up and refurbished by a professional tech.