Copies of such Wehrmacht watches ended up made during and immediately after WWII, some for business reasons and a few for military services issue. Often times the copies are so near that only an evaluation from the watch movement signifies the state of origin and also the day of manufacture. https://andrehknrv.uzblog.net/helping-the-others-realize-the-advantages-of-salvador-dali-melting-wrist-watch-33972378