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But the introduction of the midrange option in the "wrong" position looks like a 90's introduction.
That's just the position the mid has always been in for the three tone models until the more recent mid with sweep preamps came along.
The HB2 humbucker was introduced in '02, so we know your bass is no older than '02. The stacked mid-range preamp came in around '07, I think, although the Carvin Museum doesn't have info past 2006. So, I'd say we are looking at a BB75 built between '02 and '07ish.
