[Coulterthemanager]

I've been playing saxophones for a few years now, and have had the chance recently(as band manager) to take what I pleased from the instrument storage as long as I returned it in good condition. I found a tenor I'd never seen before, and it doesn't play but I'm seeing if it will. Oddly enough, it has a key under the f key which reminds me of the key used to play Bb up top. The key's perpetual staying down is one of the reasons the sax won't play, but for the moment could someone tell me what this key does?
Note: The saxophone is marked as being from Cleveland Musical Instruments Company, and not much more is known due to the fact that my teacher had never even seen the thing before.

 

[warp x]

It's most probably the G# trill. Featured on many older horns. It's supposed to be down until you finger regular G#. At least that's how it works on most horns.

 

[Coulterthemanager]

Awesome. I figured out a few minutes ago that it had to do with the G#! Thanks a ton