Hi guys. I have this Wakmann 24 hour military watch that I'm seeking a bit more info on. I've never opened the case back but I know it's an automatic. I can't hear the rotor when winding but I'm sure it's an auto; shook it gently after the mainspring was depleted and it started to run. This was my great-grandfather's watch. I'm not sure if I have the story behind it correct but I believe he wore it when he served in WWII. Here are some pictures, any info is greatly appreciated!