Yeah, I'm suspecting something like that too. I believe Raleigh USA had their own facility in Seattle, I read something like that somewhere.
The various markings on the bottom bracket have a similar layout(as can be seen in the other thread I linked to), but the actual serial number on mine is missing some letters and/or numbers.
So, I'm glad I'm one step closer but it still bugs me that I don't know the EXACT model and make. I want to put some decals on it, but I guess I wouldn't be too far off putting a Raleigh logo on it.