Only half of one, TR11/54/55 Transmitter Receiver that is the receiver part, also used on most bombers of WWII including the Mozzie.
If all the gubbins inside it should fetch that at auction and if the internals are really good a fair bit more
I have two of those plus a complete Transmitter Receiver
https://www.iwm.org.uk/collections/item/object/205210941