Leica MP Betriebsk SN#2922959 Leica MP Betriebsk shown with Gold Sultan of Brunei 50mm Summicron Leica MP Betriebsk The Leica MP Betriebsk is the designation given to cameras that are used internally within Leica Germany.  Extremely Rare, more than likely no more than 25-50 units were ultimately produced.  Identified on top plate engraved 'Betriebsk'.  The box that this camera comes in shows no identification other then the SN#.