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 stores). The rod has 5 holes which allows the set to adapt to several door thicknesses. Each handle is set on a gilded metal "ring" (bronze?) patinated by time. The set is in good general condition, functional, no cracks or chips on the porcelain which is still very white, but obviously has the marks which testify to its age: rare and discreet stains on the porcelain, remains of old paint on the bronze rings. The handles measure approximately 6.5 cm in length, 4 cm in width and 5.5 cm in depth (ring included), the rod measures 7.5 cm in length and has a square section of 6 mm on each side.