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As an American, I'd love the option for 24 hr and 12 hr. I work with both formats often and can see the benefit of both (and even bigger benefit to just using 24 hr period).
As for watches, one could easily put two sets of numbers at each mark so that you don't have to change from a 12 hr watch in terms of analog. I doubt most people would be confused over whether it is 0100 or 1300 or any other time any more than they would be confused knowing whether it is 1am or 1pm.
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