With its mix of tritium tubes and Maraglo lume, its unidirectional, rotating dive bezel, its oversized, knurled steel crown, its 24-hour military-time scale, and its sapphire crystal, the Arctic JDD is meant for hard use. And though the design has been a fixture of the brand’s catalog for some time, the new white-dialed model is a welcome addition for those who prefer the look of a less serious watch.