TromboneChat

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?

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

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.

Picture ?

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