That Nishiki is the closest I've seen. The cable guides on the bb and the bb lugs also match. The front top tube lug didn't seem to have the cutout in it, but after looking at those Superbe pictures I went back and scraped at it and dug out a bunch of what looks like body filler and found there was a cutout after all. The detail on the front of the headtube lugs isn't exactly the same as the one you linked, but very similar, possibly just a different year?