it's kind of difficult to tell, but it looks like a hofner to me. You can almost make out a script logo on the headstock similar to the one that hofner uses.
It looks small and short-scale to me, so probably a student model. That could be a Gretsch headstock, but information on their early 50s models is nowhere.
However, the pickup looks to be one of those P13s speed-bumps made by Gibson and used mostly on Harmonies and Kays. So my guess would be it's some sort of catalog guitar.
I posted this question on another forum and got this answer:
"It is a guitar from the United Code factory in NYC, branded either Stewart or Orpheum. United Code made a few archtop models without f-holes for those brands, and this early single-coil pickup may have been made by Franz (same company that made '50s Guild pickups). Despite its black dog-ear cover, it is not a Gibson P-90; up close, you'd notice that it's smaller and the poles are off-center.
United Code is most famous for making Premier guitars during this era. None of their guitars are particularly common."
stewart and orpheum were banjo companies way back in the day. i know they devolved into names branded on cheapo guitars, but i would not have been able to spot that guitar as one. some people's knowledge of obscure guitars is impressive.
Here is the 2 pick-up version of Bo's guitar on Ebay (Link)
"This is a cool vintage guitar made in he USA in the late 50's or early 60's. This one is missing the logo but I have seen these with both the Premier and Stewart brand names. I think this one is a Stewart."