It does look like the Focomat I, except the enlarger head on your enlarger looks more oval, while the space between the two 'rings' on your enlarger head is larger than the Focomat I in the Leitz enlargers page.
It is more like Focomat Ia and for I there is no negative folder.
How I can check this?
I cant find aperture, so is it possible that voltage transformer is missing?