Muv, this one is post WW2, there are a couple of "pre-pretty" photos in the Vintage Shop thread...this machine is interesting (to me, anyway) in it's likeness to a Singer!
It's much like a clone in that the bobbins, bobbin case and slide plate from my Singer 115 will fit it. It's got the front tension tho, of a 66. The feed dogs drop. It has a reverse, altho in the Singer the lever for stitch control is down for forward stitching, and up for reversed stitches. The Köhler is opposite of that...up is forward, down is reverse.
I'd love to find a manual for it... it's a model 11-30. That's in big gold lettering on the front of the machine, and reminded me of a Pfaff in the way they put the model numbers on the front pillar.