The face isn't flipped upside down, it's just turned to the inside of the wrist.

Makes it easier for a right-hand to access

> There’s another less obvious protection as well. A watch on the outside of your wrist will have the crown facing down (when hands are down). On the inside, the crown is protected. This matters when you’re knee deep in water and mud sloshing around. The water is less likely to get inside of your watch and mess with the movement.

this allows drainage of water when in hands downward position.