This is a Shonan Kosakusho signalling / projector lamp made in 1979 in Tokyo, made from sold brass and tempered glass.
 
Reclaimed from Mid-Century war ships, Shonan manufactured these during World War 2 until the firestorm on Japan ceased production. The tooling survived and production continued during the late 1950s until the early 1980s.
 
Typically the Daylight signalling lamp would have been used to signal from ship to shore, the precision optics of the reflector focuses the light output of the 12v 60w bulb to become narrow beam of intense light.
 
The lamp is made from brass with great mechanical features such as lamp focus mechanism and shutter controlled by the lever on the top.  The lamp also has pan and tilt levers for locking the fixture into position.
 
The shutter works by the sprung lever pushing a cylinder over the light source.  After a push on the lever it automatically returns and shut off the light.  The same mechanical process as a morse code machine. The sight on the top of the fixture is used to target the receiver of the signal.
 
Specifications:-
Width - 30cm
Depth - 30cm
Height - 52cm
Lamp - 12v 60w Tungsten (110v - 220v transformer supplied) Weight - 19kg