...another tie-in to that Hercek-restored Rambo! In that thread we discussed a letter of authentication that Deno Andrews had written for someone selling a Rambo Hoppe. I wanted to know how Deno was able to tell that the cue was made by Rambo. His response was that it was all in the letter and had to do with the joint, tapers, etc...basically stuff that I still don't know. Since then I have studied pics of known Rambo butts, joints, etc., trying to find consistencies so that I could eventually tell if a Hoppe 2-piece was made by Rambo - still not there yet. But I do believe that Deno has the knowledge to do so. I don't know anyone else who does.
To answer your question, no, just because it has a Hoppe ring doesn't mean it was made by Rambo. But if it has one of the first two labels, and the Hoppe ring, then it MIGHT have been made by Rambo, since he was working for Brunswick during the period of the first label and most (if not all) of the period when the second label was used.