One size up from the 28mm, this 277200-0017 is 31mm steel with an ivory dial, $9,340, and rated to the same 100m every Oyster Perpetual carries regardless of diameter. The jump from 28 to 31mm is small on paper but noticeable on the wrist — it's the size where the case stops reading strictly feminine and starts working as a genuinely unisex daily watch on my proportions axis. Same sealed case, same lack of complication, just under $1,000 more than the smallest version, for a size that fits a wider range of wrists.