You are looking at a complete Elma coffee grinder. This was not a shelf model.
You can tell it was used for many years. I do not know the age. The wheel turns the grinding spiral piece. It turned out a lot like espresso.
I do not know to adjust but assume it has something to do with the star piece and knob. It is about 12 tall. The base is 6 1/2 square.
There are two screw holes in the base. I assume it was attached to a shelf or counter. After grinding the small amount of beans, attaching it to something is recommended.