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This is the back of the watch. It can rotate freely. if you put it in the right way, you put a small ring in that should (I think) keep it stable. On that goes a rubber seal, on top of that the back cover and on top of that a lock ring. When you put it all together again the mechanism can still move around until it hits something (so it can lift 2/3mm on the top and bottom. The only place it's attached is on the axle that's connected to the "button" on the outside that you use to wind and set the watch with. It's strange. Will look at it again tonight.
It's not NATO, but sort of near NATO. It's from Daniel Wellington but I would NOT recommend it. The strap is expensive but bad quality. It has "rose gold" lugs etc. It's difficult to clean and I have Chinese NATO straps that are of better quality material. I got new straps coming in soon. Only problem I have with it now is that the entire inside of the watch got loose. Everything from the mechanism with the hands and the dial are now "floating" in there. I have to open it up when I have some time and find a way to repair it.