There is a mechanical doorbell in my apartment

I moved to another apartment, and here is such an unusual call. The house of the late 50s. The apartment was almost like a museum of the USSR, but the former owners took most of the things.

Up to this point, I didn't even know about the existence of such devices. To make a call, you need to turn the twister with the inscription "please turn". The mechanism is similar to a bicycle bell.