Marathon Watch has been building precision Swiss-made military timepieces since 1939. Today, modern-day engineering and craftsmanship result in some of the world's highest-quality watches. The Marathon 46mm Arctic JDD is a rugged and reliable dive watch engineered for use in the most extreme conditions. This model features a stark dial, specially chosen to reduce glare in bright environments. The outer shell of the Jumbo Day/Date (JDD) consists of a 316L stainless steel case with a brushed finish (measuring 46mm in diameter and 18mm in thickness), a screw-in crown and a sapphire crystal. 316L stainless steel, sapphire crystal. Import. Online only.