I just edited it so its right-side up. thanks.
I did do that but should have taken a photo, I wont be back at the house until Friday so was hoping to bring the parts needed. It looks almost identical to this under the knob including the brass lever with 4-sided diamond shape:I think you have to pull the knob and face plate and have a look at the valve itself.
There will be a screw behind the metal cap in the knob.
I just want to fix the leak with a repair kit, not sure I can get it to that point in your photo i'm not a plumber. I'll look for a brand marking more closely when I am there this weekend..You need a picture of what is in the wall