This is a two piece metal clasp or latch. It looks like it is for a box or possibly a book or piece of luggage. I have not been able to identify it. It is marked "Pat June 10, 84" The 84 is for 1884, so this lock or clasp is quite old. It is 3" x 3" when laid flat, for more like 3" x 2" when installed across an opening. I would appreciate any suggestions about what this piece is intended to do! MBR.