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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.

No, I’m not talking about the Submariner and Explorer II’s famously good looks – we’ll get there in a minute. Both timepieces have a pretty long history with Rolex, and over the years, they have been worn and beloved by many famous faces.The Submariner is famous for its James Bond appearances, author Ian Flemming writing, “He could not just wear a watch. It had to be a Rolex.” Over the years, Sean Connery’s 007 wore a Submariner ref. 6538 and Roger Moore sported a ref. 5513. And as one of the most popular Rolex models ever, we often see the Submariner sported today on the wrists of celebrities and dignitaries alike – whether they’re scuba divers or not.The Rolex Explorer II has graced its fair share of celebrities and famous explorers too. Hollywood actor, Jason Statham can frequently be spotted at red carpet events sporting a vintage ref. 1655 – the very first Explorer II reference. Meanwhile, Prince Harry prefers the modern version of the watch, and owns the 42mm Explorer II ref. 216570 with a white “Polar” dial.This is where the differences between the Submariner and the Explorer II become very apparent. First up, the Submariner has a colored unidirectional timing bezel that today is available in black, blue or green. And before Rolex started using modern, scratch-resistant Cerachrom (aka ceramic) bezels on the Submariner in 2007, it featured an aluminum bezel. The bezel is really one of the main selling points of this watch, as its color really adds some great personality to the wrist, and is one of the defining characteristics of the Rolex Submariner collection.The waterproof Oyster case on the Submariner clocks in at 40mm, and along with the bracelet, can be either constructed from Oystersteel (904L stainless steel), solid 18k yellow gold, or Rolesor (two-tone steel and gold). This is another big selling point for a lot of collectors, as the combinations of alloys and bezels really allow for a lot of style and creativity. And before I forget: the Submariner has always featured an Oyster bracelet, but in recent years was updated with the improved Glidelock clasp, which allows for tool-free adjustment for a perfect fit.