Do you have a manufacturers part number, most often located on a plate
on the back,or very faintly on the instrument face?
Looking at the attaching nuts it could be late to post war.
No plate on the rear only the number P6301
On the face - Part # CT2F1039-3, General Electric, Serial # B-14947, 24 volt.
The last "3" on the part number is hard to read and may not be correct.
Thanks for answering the message.