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The Flyblack function means that the chronograph hand can be reset to zero and immediately started again by pressing once the pusher. That’s why there are two hands for the chronograph.
Watches featuring a small seconds have a smaller subcounter, usually located at 6h, which indicates seconds.
Divers offer a better waterproofness than traditional watches. They are equipped with a graduated rotative bezel in order to calculate diving time and they also feature a better luminescence.