It’s interesting to think that on the one hand, Rolex produces fine luxury watches on a large scale for the general population (who can afford them, of course). Yet, on the other hand, if you look at many of their collections, they were, in fact, initially created for a niche audience. The Submariner for divers, the GMT-Master for pilots, and the Explorer II for spelunkers. That’s right, spelunkers — adventurers who explore caves. While there are a few common features between the very first Explorer II reference and the latest one, there have been plenty of upgrades and changes over the decades. From the ref. 1655 that debuted in the 1970s to the newest iteration, ref. 226570, which launched in 2021, let’s delve into the history of the Rolex Explorer II. Join us as we investigate the Explorer II evolution through a handful of models.
Rolex Explorer II Ref. 1655
In 1971, Rolex unveiled the Explorer II as the larger sibling to the original Explorer I wristwatch. The inaugural reference was the Explorer II ref. 1655, sporting a 39mm stainless steel case and matching steel bracelet. And because these watches were created specifically for spelunkers, there are a few key features on the ref. 1655 that made it particularly practical for them.
First, there’s the extra 24-hour hand that points to a fixed bezel with the 24-hour markings. The logic behind this was that folks that explore caves are often in the dark, thus, can’t tell the difference between AM and PM. Therefore, because the 24-hour hand points to either 10 hours or 22 hours, the wearer can now know whether it’s day or night. It’s important to note that Explorer II ref. 1655 is not a dual time watch since the 24-hour hand is coupled to the traditional hour hand and the bezel is fixed. We will see that later on in the Explorer II’s history, Rolex did make changes so that the watch eventually became a dual-time timepiece.
Rolex equipped the early models of the Explorer II ref. 1655 with an orange 24-hour hand, later replacing it with a red one. However, those red ones actually faded orange over time, so today, all of the 24-hour hands found on Explorer II ref. 1655 watches look orange! The Explorer II ref. 1655 runs on the Rolex Caliber 1575. This is the same mechanical movement of the GMT-Master manufactured during the same era.
The Explorer II ref. 1655 was also heavy on the lume details to ensure optimal legibility in the dark. In addition to the luminescent markers every five minutes, there are small luminous squares at every 2.5 minutes too. This results in a total of 24 glow-in-the-dark accents — one for each hour of the day. Paired with the luminescent 24-hour hand, the Explorer II ref. 1655 did a great job of telling the wearer the exact time of day (or night) even in complete darkness. Given its manufacturing time frame (1971 to 1985), Rolex used self-luminous tritium for luminescence as illustrated by the “T SWISS T” marking below 6 o’clock.
As with most vintage Rolex watches that were in production for a good amount of time, the Explorer ref. 1655 underwent a few dial modifications within the same reference. Rolex enthusiasts and collectors label these different dial designs as MARK 1/2/3/4/5 dials. There are at least five Marks (MK) dials documented among vintage Explorer II ref. 1655 watches, each with slight differences in logo styles and/or font.
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While the Explorer II ref. 1655 was not a popular model during its era, today it’s a different story. It’s actually a very sought-after vintage Rolex tool watch in collecting circles. It even has a few of its own nicknames. The first is “Freccione” derived from the Italian word for arrow, “freccia,” which is in reference to its famous arrow-tipped hand.
Another popular nickname of the Explorer II ref. 1655, is the erroneous “Steve McQueen Rolex” label, which stuck after it was misreported that the actor wore one. There actually isn’t any photographic evidence that Steve McQueen ever sported an Explorer II. His Rolex of choice was a Submariner. Nevertheless, the Explorer II ref. 1655 will forever be known as the Steve McQueen Rolex!
Rolex Explorer II Ref. 16550
In Rolex-speak, “transitional references” refer to those models that include features of preceding versions along with additional modifications that pave the way for the design of future references. Take for example the Explorer II ref. 16550 presented in 1985. With its introduction, the transitional Explorer II ref. 16550 brought the larger 40mm case size, a sapphire crystal, and Caliber 3085. Rolex also revamped the dial to look similar to other sports models with the famed Mercedes-style hands and the combo of triangular, round, and rectangular lume-filled hour markers. The 24-hour hand was now also longer and thinner. Plus, Rolex now offered the Explorer II ref. 16550 with the option of a black or white dial rather than just black. The bezel remained fixed and included the 24-hour scale but the design featured inverted triangles rather than sticks for odd numbers.
The Caliber 3085 movement now meant that the 24-hour hand could be adjusted independently from the traditional hour hand to point to a specific numeral on the fixed 24-hour bezel. Therefore, the Explorer II graduated from merely indicating day and night hours to a GMT watch, able to display a second time zone. With this ultra-practical move, the Explorer II was now more appealing to a larger audience of globetrotting adventurers.
There’s an intriguing feature for Rolex collectors on the white dial version of the Explorer II ref. 16550. Due to a paint defect, the white dials actually turned into a creamy ivory color after some time. And in true vintage Rolex fashion, that “defect” commands a premium price in the market over its black dial counterpart! The Explorer II ref. 16550 was only in production for four years until 1989.
Rolex Explorer II Ref. 16570
In 1989, Rolex unveiled yet another updated version of the Explorer II with the ref. 16570. It had many of the same features as the preceding ref. 16550 with a couple of notable upgrades. First, there was the new Caliber 3185 in the earlier Explorer II ref. 16570 models. Moreover, although the dial layout stayed the same, another signature difference of the Explorer II ref. 16570 was the use of black outlines surrounding the round hour-markers on the white dials rather than the more traditional white gold ones. Against the white dial, it’s a striking look indeed. A common nickname for white dial versions of the Explorer II, regardless of the specific model, is the “Polar Explorer.”
Rolex made the Explorer II ref. 16570 for 22 years and as such, this particular reference underwent several changes over the course of its production run. While early models ran on Caliber 3185, later models housed the Caliber 3186. Furthermore, Rolex changed the luminescent material a few times. First came tritium (labeled with SWISS T < 25). Then in the late 1990s, Rolex switched to Luminova and the dials are labeled with “SWISS” under 6 o’clock.
Finally, Rolex changed to SuperLuminova around 2000 and the dials are marked with “SWISS MADE” under six. It’s also worth noting that Rolex began engraving the rehaut (the space between the dial and the crystal) of its watches with “ROLEX ROLEX ROLEX” starting in the mid-2000s as an anti-counterfeiting measure. Therefore, Explorer II ref. 16570 models made from the mid-2000s and after feature this engraved rehaut. Taking all these evolutionary changes to this particular long-running reference into account, later examples of the Explorer II ref. 16570 are notably different from early examples of the same model.
Rolex Explorer II Ref. 216570
To celebrate the 40th anniversary of the model, Rolex presented the Explorer II ref. 216570. Although it’s a completely revamped and modern model, it is also a fitting tribute to the inaugural Explorer II ref. 1655.
The Explorer II ref. 216570 features an increased case size of 42mm, making it an even more robust version of the cave dweller Rolex. To balance the large case, the hands and lume plots on the “Maxi Dial” also grew in size for even better legibility. Like its predecessor, the Explorer II ref. 216570 is offered with either a black dial or a white “Polar” dial.
In honor of the original Explorer II ref. 1655 “Freccione,” Rolex outfitted the latest Explorer II with a similar orange arrow-tipped 24-hour hand. But of course, unlike the original, the current Explorer II is a dual-time watch with a second time zone display thanks to the independent 24-hour hand. That, coupled with the date window at 3 o’clock, makes this the ideal watch not just for adventurers, but global travelers too. Powering the Explorer II ref. 216570 is the Caliber 3187.
Also channeling the original Explorer II, the ref. 216570 performs exceptionally well in the dark thanks to the Chromalight display. The blue hue that comes alive in low light can last up to eight hours, which is double that of standard luminescent material.
Rolex Explorer II Ref. 226570
In 2021, Rolex released the newest iteration of the Explorer II in the form of reference 226570. At first glance, the newer Explorer II ref 226570 looks identical to the now-discontinued Explorer II 216570. The latest Explorer II watches retain the 42mm size, steel construction, Oyster bracelet, 24-hour bezel, black and white dials, and the orange 24-hour hand. However, a closer look reveals a few important updates.
The biggest change is one you can’t see, which is the new movement driving the watches. Inside the Explorer 226570 is the same Caliber 3285 GMT movement at the heart of the current-production GMT-Master II watches. It offers a 72-hour power reserve (longer than the Explorer II ref. 226570’s 48-hour reserve, as well as Paraflex shock absorbers, a blue Parachrom paramagnetic balance spring, and a rotor mounted on ball bearings.
Other updates are much more subtle. For instance, the 42mm case is a touch thinner, as are the lugs. The slimmer lugs make way for a slightly wider Oyster bracelet (22mm at its widest instead of 21mm). The black and white dials are familiar, following the same layout as the preceding 216570 but there’s now a small crown between “Swiss” and “Made” at the 6 o’clock position. Furthermore, the hands have been modified slightly. The black dial is now home to polished white gold ones (instead of partially blackened ones). The white “Polar” dials now have matte PVD-coated hands and hour markers (rather than black glossy ones) to reduce reflections. Again, the changes are minimal but worth a mention.
Different Explorer II Models and Specs
Throughout the history of the Explorer II, there are a handful of fundamental design details that have remained the same. The Explorer II has always been exclusively made in stainless steel, it has always come fitted with an Oyster bracelet, and it has always had a water resistance rating of 100 meters. What’s more, it has always come equipped with a fixed 24-hour bezel (in steel with engraved numerals) and an extra 24-hour hand.
- Stainless Steel
- Oyster case water resistant to 100 meters
- Oyster bracelet
- Fixed 24-hour bezel
- Two hour hands: 12-hour and 24-hour
- Date window at 3 o’clock, magnified by a Cyclops lens
For the differences, here is a simplified chart outlining the different Explorer II models, complete with production dates and specs.
Reference | Years | Size | Caliber | Lume & Crysal | Function |
---|---|---|---|---|---|
1655 | 1971-1985 | 39mm | 1575 | Tritium Acrylic crystal | AM/PM Indicator |
16550 | 1985-1989 | 40mm | 3085 | Tritium Sapphire crystal | Dual Time (GMT Hand) |
16570 | 1989-2011 | 40mm | 3185/3186 | Tritium/Luminova/SuperLuminova Sapphire crystal | Dual Time (GMT Hand) |
216570 | 2011-2021 | 42mm | 3187 | Chromalight Sapphire crystal | Dual Time (GMT Hand) |
226570 | 2021- | 42mm | 3285 | Chromalight Sapphire crystal | Dual Time (GMT Hand) |
The history of the Rolex Explorer II is a fascinating one. Despite its lackluster start, not only is the Explorer II still surviving, it’s actually thriving as one of Rolex’s most popular sports watches. Whether vintage or modern, the Explorer II is a fantastic addition to any watch collection.
Great presentation of the two pieces . I found your post due the mu inquiries surround the Explorer II . This to my knowledge of investigating the internet that you are the Only person that placed the three pieces Vintage, Past ,and Present release on one photo. My purchase of one of the pieces depended on the size and without a visual reference of the pieces in one frame it was difficult. Now i will physically approach to gain a dissension. Than you.
Very nice article, it is the only one that features all Explorer II models since the beginning!
Are you able to advise if the red gmt hand on the 16550 is the same as the 16570?
Thanks Chris! Glad you enjoyed it.
Hi. great research for the E2.
I have a Caliber 16570 but most bracelets I have seen have a safety clasp over the back clasp. Mine does not have this extra safety clasp. Do you know what year the safety clasp was added? I wear mine every day and enjoy it immensely.
Gene
Very informative. Jolly good!
Thanks for sharing the history of explorer 2 , I have been keeping 16570 polar white since 2001 , robust and great watch to wear for multiple occasions.. wondering what’s come next for explorer 2 in 2020 ? Ceramic bezel ring?
Thanks for reading! Many are speculating a ceramic bezel for the Explorer II eventually but I personally would prefer if it remains in steel 🙂 Great choice on the 16570 Polar – fantastic watch.
Does anyone know why I’ve seen a Rolex Explorer 2 that just says SWISS on the dial rather than SWISS MADE? Is this a particular model or year?
Usually, the SWISS dial on the Explorer II indicates Luminova lume on the dial (made from around 1998 until 2000) while SWISS MADE indicates SuperLuminova (made from 2000 onwards). I hope that helps!
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