I have some literature/brochures from Kewanee Boiler that date back to the 1920's. I read through most of what I have and do not see "Bulldog" or any of the numbers you have provided. Can you send a picture of your boiler? It is quite possible I can help you out.
My sympathies....I have been involved in finding a hard to find leak in a Nebraska "D" Style Packaged Boiler as well. We performed several hydrostatic pressure tests, cut away areas (patches) in the boiler outside casings, etc. looking for this leak. In one particular and frustrating case, we...