Sound Powered Handset??

[mienaichizu]

I found this on our local online buy and sell site.

This is the exact description of the seller

[Vintage Telephone
Sound Power Handset
Model A.560
probably manufactured during WWII - 50's
US Instrument Corp]

What can you guys say about this?

[rdelius]

I doubt WWll Most likely 1960s .I think US instrument was part of SC.Find another and make an intercom