I don't know much about this light.  Appears to be naval search light.. 12" in diameter.  Face is cast,, the rear is copper or similar non magnetic material.  In excellent condition.  I rewired it so you can that it works. Nice looking piece from General Electric of Syracuse.  Bulb marked 660W. and 600 V. I did not try that bulb for fear of melting something down. Serial number is 1222678. Weighs in at 15 Pounds.