The custom tooled 316L Black PVD 40mm case with polished aluminum bezel and antireflective coated Sapphire crystal tested to 20 ATM encases a brilliant blue graphite dial, gilded hands and outlined markers filled with Swiss Lume driven by the sturdy and reliable Swiss made Sellita SW 200-1: 26 jewels running at 4HZ with 38 Hr. power reserve. The watch comes with a leather rally strap as well as with the classic FKM Tropic strap typically used on most all Sheffield dive watches.