Light can be hard to find when exploring the ocean's depths. Seiko's Prospex SRPK43 Night Vision augments its robust 200m of water resistance with excellent readability in the dark. The latter comes courtesy of Green Lumibrite Pro, which can be found on the hour and minute hands and the indexes of the black dial — giving the watch a night vision-like look and thus its name. The dial is also home to a day/date display at 3 o'clock, powered by a 4R36 automatic mechanical movement. Completing the stealthy look is a black hard coating for the stainless steel case and matching bracelet.