At the heart of the Deepsea’s case is Rolex’s patented Ringlock system, which uses a super hard, nitrogen-alloyed steel central ring to internally support both the extra-thick sapphire crystal and the Grade 5 titanium caseback. While the Ringlock system is largely responsible for the overall increase in the case size of the Deepsea, it actually enables the watch to be smaller than it otherwise would be, had it were to follow a more traditional case design while still retaining its same colossal depth rating.The primary purpose of the Ringlock system is to reduce the amount of stress placed on the case of the watch. As pressure on the watch increases at greater depths, the majority of it gets exerted on the front and back surfaces of the watch. Since the nitrogen-alloyed stainless steel compression ring internally supports both the crystal and the caseback of the Deepsea, the amount of force exerted on the actual case itself remains relatively minimal. Additionally, as the crystal and caseback get squeezed together, with the majority of the force being supported by the internal compression ring, the front and back gaskets of the watch get pressed together, ensuring an extra tight seal.The caseback on the Rolex Deepsea consists of two components: an inner caseback made from Grade 5 titanium, and an outer, screw-down caseback ring that is constructed from Oystersteel (904L stainless steel). With a traditional, single-piece, caseback design, the entirety of the pressure placed on caseback gets exerted on the case of the watch itself, particularly near the threads. By separating the caseback into two components, Rolex is able to redistribute much of the force being exerted on the rear surface of the watch. The outer, screw-down ring performs the sole duty of keeping the inner, titanium caseback tight on the watch, while the nitrogen-alloyed steel compression ring ultimately supports all the pressure being exerted on the titanium case-back itself.
Date Sizes While the first sizes of the Datejust and the Date were 36mm and 34mm (respectively), Rolex did add more size options to both collections over the years. For instance, somewhat puzzlingly, Rolex has in the past produced the Lady-Datejust and the ladies’ Date with 26mm cases, and the mid-size Datejust and mid-size Date with 31mm case sizes. However, perhaps for greater clarity between the two models, Rolex has since discontinued all of the smaller Date versions and currently only makes the Date 34. Additionally, Rolex has also ceased making the Lady-Datejust 26, replacing it with the Lady-Datejust 28. Furthermore, over the course of the last decade, Rolex has also added larger options for the Datejust.Rolex Datejust SizesThe Rolex Datejust has always offered far more metal choices and different style options compared to the Rolex Date. Although there are some vintage and discontinued Date 34 models in solid gold and two-tone steel and gold, Rolex has now simplified the choices to just two: full stainless steel or stainless steel with a white gold fluted bezel, both of which have 34mm cases and are fitted with Oyster bracelets.
