I am slightly baffled. I don't have this watch exactly but it's the same style.
The battery finally died recently after four long years. As you can see from the pictures, it has a leather section behind the watch face that is riveted on. There is a gap between the leather and the watch back, but it is only a few millimeters or so at the most.
I am going to take it to a jeweler or someone to change it, but how is it going to happen? The studs on there don't come off.
From the side.