I got this from Goodwill today. It's called an Energizer "quick switch". It can use AA,C or D batteries without changing anything!
You just drop 2 of the chosen batteries in the loading device and when you push it back to lock it, it automatically sizes the barrel for that particular set of batts. It has a 3 position switch which I would imagine is to send corrected power to the bulb. It is pretty well made though not water resistant. It throws a very narrow pencil beam. Good for emergency situations where they are out of one or two sizes of batteries such as just before a hurricane.
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