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The chemical composition of synthetic green sapphire includes copper and aluminum oxide, with the copper being the element that is ultimately responsible for its signature green hue. The process of synthetic sapphire production is an expensive and exacting one; however, the additional obstacles that accompany the addition of copper – and the precision required to achieve the right amount of green tint without compromising the strength or clarity of the crystal are likely responsible for its exclusive use on the Rolex Milgauss line of watches.When synthetic sapphire is manufactured, the material has to “grow” over the course of a period of several weeks. Particles attract to one another, forming layers that fuse together to create a dense and ultra-hard substance. The end result of production is a “boule” – a solid piece of synthetic sapphire shaped like a chunky cylinder, which is then cut and shaped to its necessary dimensions.Due to the high costs of production, most watch crystal manufacturers cut their synthetic sapphire boules in a perpendicular fashion, as to maximize the number of crystals that can be created from a single boule. Although this is entirely unconfirmed, it is rumored that Rolex cuts the boule along a diagonal axis to maximize the clarity and strength of the finished crystal. In addition to complicating the cutting and shaping process itself, cutting the boule along a diagonal axis significantly increases the amount of waste, which further adds cost to an already expensive manufacturing process.Despite not making an appearance until just over ten years ago, the green sapphire crystal has quickly become one of the defining characteristics of the Milgauss line. Its pale green tint possesses no functional advantages over a traditional, clear/uncolored synthetic sapphire crystal; however, the green crystal that is exclusively fitted to the Rolex Milgauss 116400GV is one of the primary reasons that individuals seek out this particular reference. The green crystal is something entirely unique to the Milgauss collection and is not something that is found on any other Rolex watch, past or present.

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.

Lastly, both the 16613 and the 116613 are fitted with stainless steel and 18k yellow gold Oyster bracelets. Depending on the year released, the ref. 16613 has either solid or hollow end-links, either a stamped or link-style fold-out extension system, and either a gold-through or an all-steel clasp. Collectors have different preferences on 16613 bracelet styles, making it a fun watch to collect.The ref. 116613 offers a more substantial hold on the wrist than its 5-digit predecessor and features solid gold center links, solid end-links, and a machined Oysterlock clasp with an innovative Glidelock extension system. The solid construction of the bracelet balances the Super Case nicely on the wrist for a supremely comfortable hold, even over wetsuits.While the ref. 116613 is noticeably more modern in appearance, it still boasts many similarities to the ref. 16613 in the form of a versatile two-tone finish, similar dial and bezel color options, the same water-resistance of up to 1,000 feet (300 meters), and an Oyster bracelet that wears comfortably and allows for tool-free adjustment over wetsuits. When collecting, it ultimately comes down to preference; do you prefer a classic or a contemporary dive watch?The Rolex Sea-Dweller Deepsea is the most robust and over-engineered dive watch in Rolex’s current lineup. While the regular Sea-Dweller is water-resistant to an insane depth of 4,000 feet, the Deepsea has an absolutely abyssal depth rating of 12,800 feet, which is more than 100 times further below the surface of the ocean than any human could physically survive.Although the case of the standard Rolex Sea-Dweller is not all that different from that of a Submariner, the Deepsea has a re-designed case architecture that allows it to stand up to the crushing pressures found at 12,800 feet below sea-level. As a result of its more rugged and highly specialized build, the Deepsea is among the largest Rolex watches currently in production, with a case diameter of 44mm, and an overall thickness of just under 18mm.

Then there’s the much more subdued fixed stainless bezel of the Explorer II which matches the case and features a 24-hour marked scale. This feature was specifically built for explorers who need to distinguish day from night – think cave explorers or polar explorers in the height of summer when the sun never sets.For decades, the durable and waterproof Oyster case on the Explorer II measured 40mm, but upon its redesign for the 40th anniversary of the collection in 2011, it was enlarged to 42mm. However, while Rolex produces a precious metal version of the Submariner, the Explorer II is exclusively offered in 904L stainless steel, and there have never been any solid gold or two-tone models ever produced. The current Explorer II is only offered on a steel Oyster bracelet with a Oysterlock clasp, but to be honest, when it comes to the Explorer II, collectors are much more concerned with what really makes this watch: the face.The dial of the Explorer II is iconic for a few reasons. The most notable being the colored 24-hour hand which circles the face. First there’s the iconic orange 24-hour hand, originally designed to help polar and cave explorers distinguish night from day, that gained its cult-status from the original “Steve McQueen” reference. Rolex eventually brought back the bright orange hand with much fanfare. Then there’s the red 24-hour hand which graced the dial for decades – it’s distinctly different than the orange hand with a skinnier body and smaller luminous triangle at the tip. The dials with a red 24-hour hand are far less punchy than their orange counterparts, but still make the Explorer II standout from the rest of the Rolex lineup.Then there are the dial colors – available in effortlessly-cool black and the coveted ‘polar’ white. The polar dial is totally cool and clean, the white face outfitted with white lume plots and Mercedes hands outlined in black. The black face on the other hand has a totally different appeal. While it boasts the same features, the darker face really highlights the stainless steel bezel, lume hour plots and lume-filled Mercedes hands (this time in white gold rather than finished black). It’s a punchier look, and the colored 24-hour hand – especially the orange one – shines against the black a little brighter.

I have mentioned more than once that Z factory makes the best replica IWC watches, especially the replica IWC Portuguese 7 Days Power Reserve, which is considered to be the most classic watch in our market. The power reserve has reached 3 days, this is a big breakthrough. Now in the beginning of 2019, along with lots of new replica watches published by other factories, this time ZF also brought us a big surprise, they unveiled the latest models of Portuguese Annual Calendar, after the release of these four models, the dominance of Z factory in replica IWC Portuguese field is further consolidated. The following article will give a basic review of these watches and share photos with you.

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