The new Sea-Dweller comes in a 43mm steel case making it the largest non-Deep Sea model, going all the way back to 1967. It's worth noting that from 2009 to 2014 there was no Sea-Dweller, until the introduction of the Sea-Dweller 4,000. The uni-directional bezel on the new model is black Cerachrom, and the graduation is coated with a thin layer of platinum. The hour markers and hands are filled with blue Chromalight lume material too.