This is pretty much what you find in old places as far a door knobs go.
It really does not matter if the knob was glass, brass or nickel plated
you can rest assured someone has got to it with a can of some ugly paint.
These are cool finds as the paint wears off and the rust or glass starts to show.
I often wonder if the painter ever dreamed they would be captured forever
at some point in time looking like this....