Arnold, at the first look I also thought it could be a PLANK 160/1 or /2 IDEAL, like your LEIPZIGER, but the mounting points where the cylinder and flywheel once was fixed are different, the bolts are still there and 100% compatible with the SCHOENNER 101/2...
I'm not shure if I will ever let it run on steam, but after replacing all seals I will soon try it on compressed air...