OK, Sorry, I get a little huffy when I think I am wasting my time.... If that is a picture of the bikes actual BB, it doesn't say a whole lot. I have seen that BB on Miyata's, Specialized's, Univega's and a couple of others. It is a pretty standard piece. It DOES NOT mean it is a low quality frame, nor does it point to a good one either. My Miyata 1000 has that BB and it is a top notch frame, as does the Specialized Expedition, also a top notch frame. On the other side the Univega specialissima use it as well, and it is more of a standard frame, still pretty good though. None of these frames used 531. Sorry if that is vague. I will look at it some more and see if anything catches my eye.