FULLER PHONE MK IV
For information about the Fuller phone, please refer to this excellent website.
This example of a Mark IV (the most common type used WW1 and WW2 is not in a wooden case, but certainly looks the part for a display. We have not had it working for a few years, and cannot guarantee if it is currently working but probably would someone with the appropriate knowledge and skills had a tinker with it.
Lovely thing for re-enactment or display.
I WOULD RATHER THIS ITEM WAS COLLECTED RATHER THAN RISK WHAT MAY BE DELICATE INTERNALS IN THE POST.