Ceramic socket from the 40s

Soviet ceramic socket of the 40s, 250V 6A, the logo is difficult to recognize. I am sure this socket is pre-war. I begged it out in one house of alcoholics - I literally tore it off a homemade extension cord, which got to them from the trash. I have almost the same socket, but without one contact, which I dug out of the ground. It has the "RZ" logo.