Here is a link from a site that you may or may not have found yet:
Specifications on instrument #
As for the cornet with the stuffy sound and pitted valves, I also have one, a Conn from 1921 that was replated 30 years ago and stored all that time. I just had the valves redone by Andersons through a local shop, less than 250 bucks with the shipping, and it is smoothe as silk now, one of my favorite horns since the valve job. You might want to consider investing what you would chance on a decent appearing horn on ebay, into one you already have and like. Just a thought?
Ken