World's first and only concave crystal (U.S. Utility Patent #8,009,521) Sablier's case is machine-milled from a single piece of 316L stainless steel and features a mirror finish. The profile of the steel case is inspired by the silhouette of a wine glass. 44mm case. Display case back design with sapphire crystal. Water Resistance: 50 Meters (5ATM). Swiss made automatic 2892-A2 by ETA SA movement. Blue dial with skeleton hour hand, curved minute and corkscrew second hands. Genuine cork and leather strap.