Sorry I’m just getting to this but I am going to email you ASAP! Thanks! @Super20J, I may have a lead on some valves for you but you're a new user so you can't send PMs. My repairman has a spare set of Conn valves from a junked Eb horn of similar era. Please send me an email at beanhillbrass at g ...

I think you are right! 20” bell. Horn stands at 3 ft. 152864 - circa 1916? No other markings other than the bell design. It is most likely, then, that what you have is a C. G. Conn New Invention "Giant" Model Contra Eb Bass, from either 1916 or 1917 (depending on which serial number list you r ...

I played on a Conn 20J for 10 years. I’m pretty familiar with the lore, hence the reason I’d love to get this playable…if the valves are out there somewhere.

20” bell. Horn stands at 3 ft.
152864 - circa 1916?
No other markings other than the bell design.

That’s close, but the tubing is a tighter wrap. My guess is (old model number) Conn 2J E-flat. https://simonettitubacollection.com/instruments-listed-by-manufacturer/manufacturer-a-e/conn/conn-ee-flat-tubas/conn-ee-flat-tuba-3-piston-7/ Actually, guts/wrap is a bit different. Hmm. Edit: posting pic f ...

Most likely model but cannot confirm:
https://cderksen.home.xs4all.nl/Conn18J ... image.html

I have an olllllld Conn, circa 19-teens. I have yet to find any info on what model or “unknown model” it is. My question for now is, were a lot of the old guts interchangeable? This tuba has everything EXCEPT the valves. I’m trying to find some that might work. (Photo forthcoming) https://share.iclou ...