The SEM-52 A VHF-low band trx. A X-tal controlled 6 channel radio made by SEL (Standard Electric Lorenz) from Germany. The black "ear" shown on the photo contains both speaker and microphone. The radio is carried in a pouch on the brest. This pouch also contains the seperate PTT-switch which is connected by a cable to the SEM-52. The batterycasing houses six cells. This radio is easely converted for use in the 6 metre amateur band. See also the info about this conversion following this link : SEM-52A Articles by Alan Tasker
The SEM-52A in its pouch. The left lead on top of the set goes to the PTT-switch (black knob below left) and the "earpiece" containing the mike and speaker.