Rolex Deepsea with D-Blue Dial (photo: Rolex)

Rolex currently offers two of its professional watch models with 44mm cases - the Deepsea and the Yacht-Master II. While their cases have the same diameter, the Deepsea is the larger case, with a thickness of 17.7 mm due in part of its Ringlock System case architecture. I posted a photo of the Deepsea's case next to the YM2 case in my model comparison post to show the difference in case thickness.

Rolex Deepsea Challenge Experimental Watch (photo: Rolex)

In 2012, Rolex created an experimental Deepsea model called the Rolex Deepsea Challenge that went down to the bottom of the ocean on James Cameron's Deepsea Challenger. While this watch was never made available for purchase, it featured a case size of 51.4 mm diameter with a thickness of 17.7 mm. It had a depth rating of 12,000 meters and a domed synthetic sapphire crystal that was 14.3 mm thick.

In short, the Deepsea Challenger is technically the Rolex with the largest case, however, the Rolex with the largest case on the market is the Deepsea. The Yacht-Master II comes next followed by the 42mm cases of the Explorer II and Sky-Dweller models.

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