Vintage white door knob set with an iron – or other metal – lockbox. The porcelain knobs are stained as can be seen in the pictures. The lockbox is rusty and most likely does not work. It looks like a hole was drilled in one side to perhaps get it unlocked. There is no key.
The knobs are 5-1/2″ long. The box is 3-1/2″ x 4″. Use these as collectible decor rather than actually on a door.