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Philosophically dfferent but functionally the same

 

Diver's bezel (count-up) measures how much time since you started from a defined beginning  (i.e. I have enough air in the tank for one hour starting...now.).
Countdown bezel measures how much time you have left to a defined endpoint (i.e., I have only one hour of air left in the tank).
Functionally the same; philosophically different.

Here's a link to a Fratello article from last year that I remembered: www.fratellowatches.com /

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