Rare Boye Needle Company Sanitary Nutmeg Grater

THIS RARE LITTLE GRATER WAS MADE BY THE BOYE NEEDLE COMPANY. Apparently they were involved in more than just sewing items. It is metal and has a clever little contraption the opens up to put the nutmeg, or whatever inside and that puts pressure on the grater. It is 5 1/2" long X 1 3/8" wide. CONDITION IS GOOD with no bends or dents, however there is kinda overall light corrosion.