This rare wall lamp is called "Ideaal"; "Ideal" in English. The name refers to the amazing versatility of the lamp. You can move it in practically all directions. The chromed arm can go up and down and it swivels from right to left. The lamp can also pivot 180 degrees in the wallmount and the shade can be adjusted aswell.
It was designed in 1960 by Floris Fiedeldij for his own company Artimeta Soest. It has only been in production for a short period, so this is a rare find, especially in a beautiful condition like this one.