NEW MARINE NAVIGATIONAL LIGHT.  NSN DEFINITION IS A LIGHT SPECIFICALLY DESIGHNED TO BE MOUNTED ON A MARINE CRAFT TO INDICATE ITS POSITION IN MOTION OR AT REST, ITS SPEED AND OR ITS DIRECTION OF TRAVEL.  NSN 6220-00-548-6220.  MPN MS17999-220.  FMS-KNOX CLASS FF.  COPPER ALLOY BODY.  COPPER ALLOY ILLUMINATION DEVICE.  GLASS LENS.  USES DOUBLE CONTACT BAYONET CANDELABRA. 25 FEET LONG WIRE CABLE.   LENS COLOR GREEN. ( LOOKS BLUE TO ME).  DOES NOT COME WITH BULB.  PICTURES ARE PART OF THE DESCRIPTION.  FREE SHIPPING.  CHECK OUT MY OTHER MILITARY SURPLUS LISTINGS.