White porcelain door knob handles

Pair of white porcelain door handles from the first half of the 20th century or earlier. One is attached to the metal rod, the other is to be put in place by means of a small nail or screw (not supplied, easy to find in the trade). The rod has 5 holes which makes it possible to adapt the whole to several thicknesses of door. Each handle is set on a "ring" in gilded metal (brass. Bronze?) not quite identical. One has a patinated gilded bronze appearance, has a small draught, but it does not bother the winding it seems to me, and is on the part that will be in contact with the door and therefore will not be visible. The other is even more patinated so that it is difficult to distinguish the golden color (but which can probably reappear by polishing the metal). The metal rod has surface corrosion but it is not troublesome for a reassembly on a door. The porcelain parts are intact, still very white. The handles are 6.5 cm long, 4cm wide, 5 cm deep (ring included) for one, 6 cm for the other, the stem is 8 cm long.