Awesome shape it's in too! Found one of those deep nearby on the other side of town, in the front yard of the old watch case factory. Found many with varying states of damage downtown across from the old Elgin Watch factory. Apparently they went home with a lot of folks who worked there and went into the yard dumps after so many years or just went into the yards. They were often used by people who took piece-work home with them, found some with different springs/screws in them also. Yours is a great looking specimen. Most of my finds were pretty beat up.