Should have a model name on the dial or on the back case of the watch.
It doesn't need a battery as it is a automatic movement. I weighted rotor swings back and forth from your arm movement to wind up the watch.
This is a pic of the back of my other watch that allows you to see what is going on.
I assume your 'gold circle thing with numbers' looks like the bezel on my watch. If so it is a diveing bezel and tracks the amount of time that passes.
Quite useful once you know how to use it.