The somewhat famous Korean-War-era AN-GRR-5 shortwave radio receiver.
Mine came to me without the case and the power supply / speaker unit. Luckily, it also came to me with a replacement for that unit that someone had built somewhere along the line. I'm always looking to complete the radio set if someone happens to come across one.
In its full configuration, this was a radio that could be operated off of almost any power source available and with any improvised antenna. The controls are so solid that they convey a feeling of total indestructibility. I am also all but convinced that in its original case, it could be used a truck jack stand in a pinch.