The bore on this instrument is appx. .750 ( as measured with a tape measure ) Serial number is F589XX. Bell is 20"
With paint.

Paint removed!

Also, still to be looked at are the valve caps and 1 valve stem and button. The valve caps are badly cross threaded and possibly one cap and definitely a valve stem and finger button have been replaced with non original parts.
Offending valve caps

So, if it is indeed a Conn, I'm wondering if I can use some sousaphone valve caps and valve stems for replacement, or possibly also replace the valves themselves as there may be damage to the threads in the valve as someone has soldered the valve stems into place.
The instrument is actually playable now, but yes still could use a lot of sprucing up.



