Here are some pictures showing how the frame looked when I acquired it. I assume the BB was original, but I don't recall the manufacturer (but remember that I didn't recognise the name). In addition to the frozen BB, the left DT shifter stud was sheared, requiring brazing on a new one. Bummer that I won't be able to pin down the specifics, but still, I am immensely satisfied that I was able to rescue the frame and enjoy riding it. I painted it with acrylic lacquer, but am not pleased with its durability so a repaint is planned for a year or so down the road.