1918 CG Conn - looking for information

[blessedinmontana]

Back in 1979 I found a silver Conn slide trombone at a swap meet and I've had it ever since. My intention, as an 18yo kid, was to learn to play it, but sadly, I never did. I kept it on display in my music room and puttered around on it from time to time to keep the slides lubed and working smoothly.
I have learned that it was made in 1918, but I can't find a model number anywhere on it.
Did 1918 trombones not have model numbers?

[BGuttman]

Conn model numbers that we are familiar with started in 1919.

Earlier models included New Wonder (and possibly some others).

While it may not have a model number you would recognize, it most likely would be similar to the 2H, 4H, or 6H. If it's High Pitch it might be like 3H or 5H

[LeTromboniste]

There should be some letters stamped at the bottom of the slide grip that indicate size and pitch. For example an instrument marked "S LP" should usually correspond to a 2H.

[Tbarh]

Picture ?

[mazman]

It should have some letters somewhere. How many tuning slides does it have?