Hi Don,Thank you Sir!
I did not see any markings visible on the tube, perhaps they are further up into the stem. I will try to gently coax it out, I will not break it. Thank you again.
Or possibly it's not stamped. The patent number was a long one, and the Tro-Tube pipes had the patent number stamped on the shank as well as on the stinger. They may have used the stinger far past the expiration date of the patent and the "Tro-Tube" era. The stamping on mine runs almost up to the carburators.