Yep. That BB cup does indicate a great deal. Next question: Is the fixed cup left hand or right hand threads?

It would seem to be narrowed down to a French, Swiss, or possibly Belgian frame. (edit: or Swedish?) That's a lot of bikes to consider. As the most unusual feature is the rather striking fork crown, that is probably the key to identifying it. The rest of the bike has relatively common features.

I suppose if it turns out to be left/Swiss, there is at least a very small possibility that the BB could have been re-tapped from BSC at some point. It does happen, though it is rare. Perhaps we can now say with only 99.936% certainty. Hmm, wait, Wastyn was Belgian right? Maybe his second cousin Eddy back in Bruges or somewhere built it?