A 1220m rating puts the Sea-Dweller in the small group of watches in my catalogue built for commercial saturation diving, not recreational scuba — recreational limits sit nowhere near that depth, so everything past roughly 100m here is pure engineering margin. At 43mm in steel with the in-house caliber 3235 inside, it reads as one of the more substantial cases I've measured in the modern Rolex sport line, and the black dial's contrast holds up on my legibility axis even at that scale. At $15,650, the price tracks with what a case built to that depth standard should cost — this isn't a watch where the number oversells the price.