Telefunken FuG25a IFF transponder (Se25a) from German night fighter

Here is a beautiful example of the Fug25a 'Erstling' IFF transponder used to identify German night fighters on German radar sets. Not a war relic but apparently an 'as issued' unit that was either removed from an aircraft or from a parts depot. It is complete with two of the very rare Morse coding keys that keyed an audio signal that could be recognized by the radar operator on the ground.