Well, its an, er, Ehr:
From Karl Ehrmann of Pforzheim, Germany. The case was also made in Pforzheim, by Richard Pfisterer as was the PUW 361 movement. bidfun-db Archive: Watch Movements: PUW 360
Mid to late 60's I believe.
For once, I got a watch that came with a good crystal and strap. Working OK so far.