The Armin Strom Tourbillon Skeleton Water was introduced in 2016. As all 'Water' models in Armin Strom's collection, the case is done in stainless steel, while the movement features blue (PVD) details.The Tourbillon Skeleton is powered by the in-house, hand-wound caliber ATC11-S with tourbillon escapement at 9:00 and a power reserve of 10 days.