Antique Rare Stromberg Carlson #TW-31 Space Saver Counter Top Phone
RARE ANTIQUE STROMBERG CARLSON #TW-31 PHONE
This is what is known as a Space Saver phone.
These were typically mounted to a counter top, rather than the wall, where they took up no working space, hence, the name, and were normally used in commercial applications.
These need to be used with a subset in order to work properly.