Description: Rolex Sky-Dweller 336938 Pre-owned Rolex Sky-Dweller 336938 (2025). Rolex updated its most complicated collection, the Sky-Dweller, back in 2023, keeping most of its core design intact while introducing a few upgrades, such as the newer caliber 9002. It also made a few minor changes to the bracelet, primarily the width of the center links and lugs. Keen-eyed collectors will also notice that the seconds hand is thinner, as is the fluted texture on the screw-down