Hi Jacob,
Correct me if I'm wrong but the guitar should be a 3-bolt. This has several implications.
First, although a S/N starting with 'B' was intended for basses there are plenty of examples in the
Registry of guitars having a 'B' S/N. G&L was not know to be all too strict with using neckplates for the right instruments and/or in order. If a neck plate was still available, they'd use it. Hence, I found 61 instruments with a S/N between B52000 and B53000, none of them a bass! Unfortunately, B52658 is not registered (yet).
Secondly, that instrument is produced before 1997. In that year, G&L transitioned to a 4-bolt neck with the S/N starting with 'CL' (and shortly thereafter 'CLF') stenciled on the back of the headstock .
Finally, the US model have no 'Made in USA' anywhere, they just are! So don't worry about it, that guitar should be US made.
Here a couple of headstocks showing the different ASAT decals I have in my collection, as well as the different style of truss rod which would be another indicator of the age of the instrument. The one on the left is pre-1992 whereas the other 2 are post-1992; 1998 on the left, 2004 on the right (which has the 'Guitars by Leo' under the 'G&L' decal).


Also check out this page on
Serial Number significance in the Knowledgebase and
Greg Gagliano's G&L web pages which has a wealth of pictures you can compare yours to.
Hope this helps,
- Jos