I was detecting on the farm where my Great- Grandfather lived and dug up what I thought was a small watch case. After a lot of cleaning, I saw that it is some kind of coin holder (Seated dime was not included). The center is spring loaded and would hold from nickles on down, probably 4-5 of them. It was probably worn on a chain around the neck. Maybe it was used for something else, but coins fit in there nicely and slide right out. Ron