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The earliest movement used in the Rolex Explorer II was the Caliber 1575, but over the years it was replaced with more technically advanced movements to help this watch reach its full adventure potential. The first big upgrade was the Cal. 3085 which allowed the 24-hour hand to be adjusted independently from the 12-hour hand. This meant the Explorer II no longer just indicated day and night hours, but could also be used to track a second time zone – turning it into a GMT watch. Then came the Cal. 3185 which was improved upon more with a Glucydur balance wheel that is not only paramagnetic but was resilient in extreme temperatures. The 3186 came next with a blue Parachrom hairspring that is anti-magnetic and shock resistant for even better durability. Finally, we have the modern-day Cal. 3187 which features all the upgrades this watch has gained over the years – from the GMT functionality to the blue Parachrom hairspring. It’s also notable for its high-performance Paraflex shock absorbers, 31 jewels, -2/+2 seconds per day accuracy and 48-hour power reserve.The Submariner has a much longer history, so we’re going to start with the automatic Caliber 3135, which, while upgraded over the years, has been used in all date-displaying Submariner watches since 1988. While the aesthetics of the Submariner can vary, the Cal. 3135 has remained a trusted source of power for this beloved timepiece because of its sheer reliability. Today, the upgraded Cal. 3135 movement is COSC certified, outfitted with the anti-magnetic and ultra shock-resistant blue Parachrom hairspring, and boasts an impressive 48-hour power reserve just like the Explorer II.

Looks-wise, the watch that comes the closest to an all-steel model is now the ref. 116509, which is cast in solid 18k white gold and has the price tag to prove it.That means a delve into the archives is the only avenue still open should you want one, and it is the previous generation that is proving the most affordable. The ‘Zenith’ Daytona ref. 16520, powered by the fabled El Primero, is still the gateway into steel Cosmograph Daytona ownership.Of course, the word ‘affordable’ is all relative. Prices start at around the $20,000 mark, which is a hefty slice of anyone’s money. Yet beyond being one of the most handsome and capable models ever made, any Rolex Daytona represents perhaps the surest investments watch collecting has to offer.It’s a tough call, but the starkly austere Explorer might well be the watch that has changed the least (visually) over its 70-year run. That is even for a manufacture that updates aesthetics at the glacial pace that Rolex does. Every reference, from the prototype Pre-Explorer ref. 6150 from 1952 up to the last of the ref. 114270s in 2010, have been simple three handers, with the beautifully legible white on black 3/6/9 dials, housed in a 36mm case.Then along came the ref. 214270, identical in the detailing but the first example to grow beyond the dimensions in 58-years, measuring 39mm. It increased in size for the same reason as the Datejust – fashions demanded it – but unlike that watch, it became the only option available.That is no bad thing. The Explorer is perhaps the last of the true tool watches in the Rolex catalog. There is nothing about any iteration of the watch that is designed to look flashy or draw attention to itself, and a few extra millimeters doesn’t change that. The new Explorer is basically the old Explorer, and whichever you choose will come down to whether your wrist size suits one or the other.Its strength has always been in its simplicity, and it remains one of the best value for money prospects on the pre-owned Rolex market. $5,000-$6,000 is the buy-in point for a well set up example of the ref. 114270 or, if you fancy going the real vintage route, the celebrated ref. 1016 (personal timepiece of James Bond author Ian Fleming) starts at a little over twice that. Tough, elegant and perfectly built, the Explorer has always stayed true to Rolex’s roots.

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.

Rolex has been manufacturing watches with 34mm case diameters for the majority of their long and distinguished history; however, these “mid-size” models such as the Date and Air-King often get overlooked due to the multitude of options that exist in the more standard, 36mm Rolex Oyster Perpetual case size. However, Rolex has manufactured a number of excellent watches – both vintage and contemporary – that have 34mm case diameters, and their highly versatile size allows them to look at-home on wrists of virtually any gender or measurement.Although the Datejust collection has historically had a case diameter of 36mm for the standard full-size model, Rolex also manufactures a line of watches called the Date that offers many of the same design traits and features of the Datejust – even the same movement too – only in a slightly smaller overall package.One of the most “quintessentially Rolex” watches currently in production with a 34mm case diameter is the reference 115234 Date. With a Cyclops magnification lens, stainless steel Oyster bracelet, and 18k white gold fluted bezel, the reference 115234 Date checks all the same design boxes as the Datejust, just with a slightly reduced size. Additionally, since the 34mm Date and the 36mm Datejust share the same movement, the reference 115234 is in no way a “lesser” watch compared to the Datejust, just one that is 2mm smaller.Since consumer trends favored smaller wristwatches in past decades, a number of great vintage Rolex references exist with 34mm case diameters. One of the longest-running Rolex models of all time is the reference 5500 Air-King, which boasts a super clean and minimal dial design that perfectly complements its slightly reduced case size.The reference 5500 remained in production for thirty-seven years, during which time it was fitted with both Rolex’s Caliber 1520 and Caliber 1530 movements – neither of which were chronometer-certified. Due to their long production run, reference 5500 Air-King watches were manufactured in relatively large numbers and can still be purchased for very reasonable prices. Fitted with one of the cleanest and least text-heavy dials found inside any Rolex watch, the Air-King 5500 pre-dates the widespread implementation of chronometer-certified movements and represents one of the best entry points into vintage Rolex collecting.Although the Day-Date President is the classic all-gold Rolex watch, it has never been manufactured in a size smaller than 36mm. However, throughout its history, Rolex has produced a number of all-gold watches within their Date collection that have 34mm case diameters, and lack the additional complication for displaying the day of the week that is found on the flagship Day-Date line of watches.One of the more modern incarnations of the all-gold 34mm Date is the reference 15238, which stands out due to a number of characteristics that help separate it from previous iterations of Rolex’s all-gold 34mm Date watch. While earlier examples were made from 14k gold, there reference 15238 is craft from 18k – the same as what Rolex uses to manufacture their flagship Day-Date President watch. Additionally, the Date 15238 is fitted with Rolex’s Caliber 3135 movement and a synthetic sapphire crystal, which give it all the ingredients necessary to be a fairly modern watch.

Case is made of 316L stainless steel and brushed. It is measured to be 40mm in diameter. From side view, the case has a nice arc degree, so this ensure the watch could fit your wrist perfectly. Crown uses screw-in construction like genuine and there are delicate engravings. On solid case back, there are six notches that are exclusive to IWC Mark series. Great polishing work you can see on the back. Opening the case back, you will find a soft iron cage that is antimagnetic between case back and movement, which is the same as genuine Mark XI. By the way, the bracelet is polished beautifully. The front face is brushed while its edges are polished. There are also “IWC” on the front and other engravings on back side. The buckle pin is polished. Now at last, the watch specification will be listed below: