Cockpit Grimes light found in mannnnnny civilian and military types.  This one is cheaper because like 99% of used grimes lights, it has hairline cracks around the center of the lens. Not going anywhere, but just wanted to accurately describe what you are buying. Swap bulb for an auto 12v and, voila', it works, or keep it as 28v. FYI...the snap on base alone sells new for over $150...no joke.