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Rolex is a true pioneer in watchmaking technology. Among their most significant inventions is the Submariner, which was the first watch ever to offer water-resistance of up to 100 meters. The now-iconic Rolex Two-Tone Submariner was the inspiration behind the flourishing dive watch market as we know it, and almost every dive watch in existence today was in some way influenced by the Rolex Submariner. While it was developed for use while underwater, the Submariner has since become a coveted timepiece among collectors of all professions. The line is varied and offers a feature set to suit almost any wrist. However, today we will take a closer look at an earlier model of their Rolesor two-tone steel and gold Submariner ( Rolex Submariner two-tone ). The Rolex 16613 Two-Tone Submariner.The Rolex Submariner was developed in 1953 and made its official debut a year later at Basel Watch Fair 1954. As previously mentioned, the collection was the first to offer resistance to depths of up to 100 meters, which would then evolve into 200 meters, before increasing once again to its current and impressive 300-meter depth rating. In true Rolex fashion, the Submariner was carefully refined over the years to include a safer unidirectional bezel, improved materials, and a higher-beat movement.The original model was presented in stainless steel with an all-gold variation following in the late 1960s and a two-tone option coming to market in 1984 via the ref. 16803. The ref. 16613 was released a few years later in 1988 and enjoyed a long production run before being discontinued and replaced in 2009 with the current Cerachrom ceramic bezel 6-digit ref. 116613, marking the end of the aluminum bezel Rolex Submariner two-tone watches.

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.