These door knob back plates are made from brass with a GREAT Art Deco style. Each one has a keyhole at the bottom. A couple of them have some indents/bends. They have been partially restored with wire brushing and cleaning. Top and bottom center holes exist for securing with screws.
Measurements: 6" tall by 1 3/4" wide.
This is just one example from thousands of hardware items we have in our shop!
It can also be seen and purchased here – (copy and paste)