That's an interesting provenance!
I'm guessing you're the original owner. In any case, you bought the bass in the hometown of the "Washburn" brand's owner, Saint Louis Music (still listed at 1400 Ferguson Ave), a major distributor for many years.
Doesn't hurt that it's made-in-Japan -- if not Matsumoku, then at least Yamaki.
Hang onto any receipts or tags you might have for it, & write down as much as you recall about the initial purchase -- old photos of the axe (or someone playing it) are good as well. Should you ever decide to sell, or to pass it along to heirs, details like that provide a small bump in value but it certainly draws more interest from serious collectors.