Honestly I do not know how this thing works ! It belonged to a family member who went to school to learn to use it
It is some kind of early calculator or billing machine ..in pretty good shape ... minus a broken side window .. an easy replacement
It is a real conversation piece ..and weighs probably 80 lbs .. it is heavy ! and you can see the workmanship and the mechanical process through the glass sides
comes with the original wheeled stand ... which is also heavy !
condition is good considering age ..this thing was built to last !