Unfortunately, we have no records going back that far - whether your bass is a pre-Ernie Ball or is one of the earliest made by Ernie Ball Music Man, for those serial number records do not exist. Rod Trussbroken has an awesome website with a wealth of information on Music Man basses which may be helpful (This site not monitored by EBMM or its employees) : Home - Musicmanbass.org, Music Man, Musicman, Music Man Bass, Musicman Bass, Music Man Guitar
I also expect Rod T (aka Gav) to weigh in here any moment.
Dan



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) The closest guess I come up with based on the numbers around it is that it probably was built around July 2003., which is about two months after these basses started being shipped to stores.



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