This large fancy filigree knob dates to about 1890s to 1910s. It has a matching back plate. Both pieces are cast brass
The knob measures 1 5/8 inches across. The knob has a long neck or stem that is 3/4 inch long; it fits into the 1 3/8 inches round back plate.
We have lightly cleaned the knob and back plate. A mounting screw is included.