Suhr Guitar Serial Number Lookup Link -

If your serial number begins with followed by a series of numbers, you are holding a highly desirable piece. This prefix was used primarily on early custom-built guitars or specific limited runs directly overseen or inspired by John Suhr’s personal specifications. 3. The "M" Prefix (Suhr Modern Series)

You can email their customer service team directly at support@suhr.com . suhr guitar serial number lookup link