This is an old handrail bracket that was salvaged from a house in New York. The back plate measures approximately 2 3/4" tall. When mounted, it sticks out approximately 3 1/4" from the wall. It also has the piece that mounts the railing to the bracket.
I also have 2 more of these, so if you are interested, please convo me and I will add a special listing for you and combine the shipping.