I have a Pfaff treadle. It is an 1877. The bobbin case is like half a case the bobbin goes in on the side. Wonderful old machine. It was froze when I got it. the needle bar was glued with dried oil, when we got that clean it now coasts with a spin. I haven't put a belt on it yet.
The irons have decals and are painted. I will try to post a picture.
Ethel