First off; I can imagine how annoying questions like I'm about to ask my be...
I recently purchased a single-speed bike at a LBS. It was a trade-in. The previous owner had done a rather decent job of converting the frame to a SS. However, they had stripped the finish with a chemical bath for the "patina"(?) look. The head tube doesn't appear to have had any rivet or screw holes for a head badge. All I have left is the serial number on the BB. Initially, I wasn't that concerned about date and company of manufacture. But, the more I've gotten to "know" this bike, the more inquisitive I've become. I've searched all my known avenues of info to no avail. I've posted pics of the bike when purchased and after my paint job and some changes. Any ideas what brand this frame may be?