Help Identify Bell System Device

I’m trying to gather any information available on this Bell System device (chime/bell/?). I would like to test it, but am not sure of the input voltage.

The overall length is approximately 18". The wooden box is 10-3/4" Tall X 11-1/2" Wide X 3" Deep.

Any information would be greatly appreciated.

I dont have any idea about it.

“Bell System” was a part of Wheelock. The giant wooden box is there for acoustics.