That appears to be a vapor tight portable flood that is rated for high water pressure locations. It could be used in a factory where steam is present, an area that gets hosed down, a ship, a train, or anywhere it would be exposed to extreme moisture. With the right lamp it would make a great flagpole light or accent uplight for a big tree. I cant read the voltage or wattage. I do see it is class I which would include explosion proof fixtures where paint fumes or high concentrations of dust or flammable particulates may sometimes be present. But those would be class I div 1 or 2. I think this is strictly a waterproof fixture by the way the cord is attached. It was expensive probably selling for around 300.00 when new.
Pyle National made all kinds of specialty fixtures.