Phil, sorry the shot from the other side shows that the naked rider is naked too and his not insubstantial penis is clearly visible.
Lorry/Monkey you're correct it's an MZ, did you tell from the crazy angle of the exhaust downpipe? Always a worthy workhorse they went on forever. I remember in about 1979 when they tarted the MZ250 up a bit to bring it into the 1950's. They replaced the old hideous fuel tank with a new hideous fuel tank. Hilariously it was painted orange, the seat went halfway up the front of it- presumably to keep your tackle warmer in winter- and it didn't have the rubber knee pads. Wow. As for MZ's addition of a disc brake, well, that was virtually rocket science I seem to remember.