Articulated wall light glass Holophane brass porcelain

Articulated wall light from the early 20th century. Holophane glass. Holophane brand present in relief at the collar (see photos and zoom in). Articulated brass rod. Porcelain wall fixing system. The maximum diameter of the glass at the opening is 16.5 cm and the total height of the glass is 11 cm. The height and total depth of the wall light vary depending on the inclination given by the ball joint. In the visible photos the height and depth are 21 cm. Very good overall condition. Very rare traces due to time and use in places (see photos and zoom)).