Couch phone/intercom help
 

A Couch phone/intercom surfaced lately in my house after years in hiding. It is NIB. A first search of Couch showed a bunch of variations that were crude wood boxes. They moved on to fire alarms. This one is a marked improvement with brass finish door box and brass phone hanger. Much more modern for the day. I could not find an internet image. I do have an ancient hookup diagram where it would work with batteries for direct calls and a wiring change with a bell xfrmr for chimes. What do I have? Free to send on to phone sites.