I have an unmatched set of door knobs dating from somewhere between the early 1900's - 1930's or so. One is a very discolored white porcelain with metal base, the other being metal - type of metal unknown but a magnet will not stick to it...... They measure about 2 1/4" (porcelain) and 2 3/8" on the metal across the top. They are on a square bar connecting the 2, the bar and the metal piece attached to the white knob is rusty. The metal one has a very pretty design on the top of the handle. I will ship internationally, please contact me with your country for a shipping quote.