It is designed for scuba divers to keep track of dive times and oxygen levels.
They are more for looks now than for practical purposes, but you can still use then as a simple timer. What I sometimes do with mine, mark the current minute hand with the 12 o clock mark. Now, you can gauge at what time a certain number of minutes elapsed will be. For example, if I have 35 minutes in a parking meter, and the time is 10:20, I will mark my minute hand, and when the minute hand reaches 35 minutes on the dial, I know my time is up.
Of the 100's of watch makes/models with rotating outer dials .. which one are you talking about?????
In my experience, they can be just about anything from a slide rule to a device used to keep YOU remembering what time zone you are in as you travel into different time zones. Maybe it is a compass device. And maybe it is decoration.
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