Art Deco metal lamp base with black and silver patina

Art deco style lamp base in metal with double black and silver patina. French work from the 30s / 40s. Remarkable authentic patina. Note some rare common usage injuries in places and very slight and discreet deformations at the bottom of the circular base (see photos and zoom). The total height of the lamp base (including socket) is 26.7 cm. The total diameter of the circular base is 12 cm. The electrical system is not original. The lamp works with a bayonet bulb not supplied. The lampshade visible in the photos is not supplied.