Fairly sure it's always the same model arm to make the image transitions be more fluid. I'm sure after all of this they'll show just a female model's arm. I ima

Fairly sure it's always the same model arm to make the image transitions be more fluid. I'm sure after all of this they'll show just a female model's arm. I imagine too they picked a male model because in general men have bigger forearms, and so it will make the watch look less bulky.