Architect's lamp duo

Two architect lamps of a model that I idolize, yet it is not my kind. The studs are made of round section tubes, there is a single spring at the bottom, the top slide with a piston system and the fastening noose is a raw aluminum cast art work. What is remarkable about this model, in addition to the technical specificities I have just stated, is that every copy that has so far passed into my hands was in excellent condition, as if the previous owners, aware of the quality of this object, had tenderly pampered it. We have before our eyes a large model and her little sister. I use the feminine because it is a lamp. Unfortunately these lamps are not signed and I still do not know who is the designer who gave birth to them.