The lettering I have around the lens is "Novar-Anastigmat 1:6.3 F#10.5cm Nr.1140383", no other serial numbers or lettering other than the shutter speed and aperture markings, unless it's on the pressure plate (I didn't look that closely, was too keen to get a film loaded and give it a try after checking the bellows!)

Interestingly for a German camera the distance markings are imperial rather than metric.