Looked some old Gibson EB pix, the surround appears to be made for an archtop, so that rules out the eb3, but there was a 2-pup version of the semihollow EB-2 that it might fit (EB-2d). But the wire doesn't match other pups of this type.
Thanks for all who provided clues.
Yeah, well, you know, that's just, like, your opinion, man. - Jeffrey Lebowski