I have no idea what it's for or what it's worth. All that is stamped on it is 7.m.m.. So if you have any knowledge about it you are better off than me. The rear flip up sight is fully functional. Overall length is 30 inches. Bore is clean. Has pitting and has sat in old shed for years. Let's start at $50 o.b.o. I don't have any clue of it's value. Located near Keats which is west of Manhattan.