TubaForum.net

This Tuba Tuesday the Museum features a Conn, New Invention Professional, EE flat tuba, 4 piston, 1912.

Bell size is 17.5”, bore is .689 and it is 35.5” tall.

“MADE BY / C.G. CONN / ELKHART / IND.” on bell. Floral engraving around identification marks.



https://simonettitubacollection.com/ins ... -4-piston/

That one looks like a more rare version I've encountered that actually offers a pretty darn good scale.