Ismacs has a list of 101 versions but not very detailed; 101-10 and 101-11 have aluminum body, most common was cast iron. How does the automatic lubrication of this model work? Never heard of it before, I think the meshing gears are to be greased, cleand and regreased anually. It's a very interesting model, I have never seen in real life, and they don't turn up often around here.