I found this on craigslist and I'm probably going to look at it tomorrow afternoon. It is listed as a Seraph Super Mountain, but I haven't been able to find anything about it. I did find Mizutani Suer Seraph, but they look nothing like this bike. It looks pretty cool with the double top tube and racks, just not sure if it's worth anything. sorry for the grainy photos.
With the twin top tubes, chaincase and stirrup brakes, it looks like a post-war Japanese market model, though similar models did continue to exist up into the 1960s. Not sure of value but it would be a real conversation piece. It may have a registration sticker with a date.