Early Conn Identification?

[Gongadin]

This is for the folks who have access to early C. G. Conn catalogues.
Can you help me identify this horn?
Beginning of WWI era
BBb 4 front piston valves
20" upright bell, not detachable
about 36" overall in height, from bell rim to bottom of bow.
Approximately 16" in width - body.
Thanks!
Would also be interested in finding an early Conn mouthpiece for it.

[Gongadin]

Thanks, Mark;
I appreciate it!
Got any catalogue pages that you can scan for me??