Fullerphone MkIV dated 1943 in unusual but obviously correct box, the strap is 2" width rather than the standard field telephone shoulder strap. Correct headphones. Comes with the Superposer which was used with it according to the wiring diagram.
Not known if working, unusual and interesting items.
This is an item from my own collection, postage extra, payment can only be made by Bank Transfer or Paypal.