Alpina Alpiner Extreme Skeleton Automatic AL-520GSKT3AE6B. 

In 1933, Alpina set the standards of the modern sports watch by unveiling its Alpina 4 timepiece: antimagnetic, antishock, water-resistant and stainless steel. True to the Maison’s DNA, the current Alpiner collection presents strong and sturdy watches that can resist the toughest conditions whilst remaining pure and easy to wear.