This unusual pull is either bronze or copper. It appears to have a copper flashed finish, but does not stick to a magnet, so it may have a bronze base. It is an old knob with a small back plate. The square shape with a raised center surface gives the knob a Mission style look.
The knob measures 3/4 inch square. It projects from the surface of the drawer or door 1/2 inch. The small back plate is 5/8 inch round.
The original screw will be included.