1920's outlet Intercom System

1920's Intercom System - factory green - metal - has a cardboard backing - there outlet is wear on the cloth wire - there are a set of bells on the top that are rusty - the black earpiece is Bakelite - looks complete but I don't know if it works - cool piece - Connecticut Tel & Elec. Div. G.A.I. Inc. Meriden, Conn - has rust issues all over - the system is 5" x 5" and 2.5" deep - the round earpiece is 2.5" x 3"