This is just how I bought this. It came in this box which is very nice in itself and would be great for a collector but probably not original to this telephone. I have never seen one of these and have no idea what its purpose was. It has a special plug socket that I assume allowed a power supply to the bulbs. It has a very unusual transmitter. The handset is Siemens and the lead weight inside has no diagram. For a telephone collector this would make a nice interesting item. This a not working collectors item and in great un restored condition.