This is a antique Cast Iron Coffee Grinder Wheel form Germany. The wording around the wheel circumference is EISENWERK VELBERT RHLD BERGISCH - MÄRKISCHES. I don't know which is the maker's name and which is the address. The wheel has a diameter of 18 1/2" and is 1" thick. The wooden grip extend 7 from the wheel.
The wheel weighs almost 23 pounds.