This reference 226570-0001 is a GMT-equipped sport watch, and importantly one that mechanically advanced the collection from the previous 216570 reference and brought the Explorer II line into the modern age of Rolex watches. With a solidly built 42mm stainless steel case, matching triple-link Oyster bracelet, and a fixed 24-hour outer bezel, the watch is instantly recognizable as an Explorer II, with its silhouette featuring much of the name robustness as the previous generation albeit with slightly more tapered lines, as noticeable in the slimmer lugs.