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The Rolex Explorer II was designed to solve a practical problem: in polar regions or underground, where daylight cannot reliably tell you the time of day, its extra hand completes one turn every 24 hours and points to a fixed 24-hour bezel. Rolex introduced the watch in 1971. Its central idea remains in the current Explorer II, even as the movement, case and travel-time function have evolved.
Why Rolex created the Explorer II
Rolex says the Explorer II launched in 1971 as an heir to the Explorer, intended for people venturing into environments where day and night blur. Its official history names polar explorers and speleologists—cave explorers—as users for whom natural light may not provide a dependable day-or-night cue. This is Rolex’s stated design intent, not evidence that a particular explorer wore a particular reference.
As Rolex puts it in its official history: “The watch featured a distinctive 24-hour hand, an invaluable aid around the poles and beneath ground when you can’t tell night from day.”
How the 24-hour hand works
The Explorer II’s additional hand makes one revolution in 24 hours and is read against a fixed bezel graduated over 24 hours. That arrangement lets the wearer distinguish daytime from nighttime when the usual light cues are absent. The bezel does not rotate.
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On later generations, the independently adjustable hour hand also makes it possible to use the 24-hour hand and bezel as reference time while the main hour hand shows local time. Rolex describes this as a way to display a second time zone. It is a practical extension of the original day-or-night function, not a separate rotating-bezel system.
Explorer II generations
Rolex confirms the original 1971 launch and documents the 2011 restyling. The intermediate reference dates below come from a specialist retailer’s chronology, updated in June 2026, and should be treated as approximate production boundaries rather than a complete official Rolex register.
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| Reference | Approximate period | What changed |
|---|---|---|
| 1655 | 1971–1985, according to the specialist chronology | The original Explorer II. The specialist guide describes its 24-hour hand as linked to the main hands. |
| 16550 | Introduced in 1985, according to the specialist chronology | The first Polar-dial generation; the guide says it introduced an independently adjustable hour hand. |
| 16570 | 1989–2011, approximate span in the specialist chronology | A long-running generation offered with black or white dials, according to the guide. |
| 216570 | Restyled in 2011; Rolex does not state an end date in the cited material | Rolex’s newsroom records a 42 mm case. The official brochure lists calibre 3187 and approximately 48 hours of power reserve. |
| 226570 | 2021–current, according to the specialist chronology | The current generation, with calibre 3285 and approximately 70 hours of power reserve on Rolex’s US product page. |
The progression is less a change of purpose than a refinement of it. The 24-hour day-or-night display persists; the independent hour-setting function documented in later generations makes the watch more useful when crossing time zones.
What changed in the current Explorer II
Rolex’s US product listing, checked on October 4, 2026, identifies the current Explorer II as reference 226570. It has an Oystersteel case measuring 42 mm, a fixed 24-hour graduated bezel, an additional orange 24-hour hand and a date display. Its automatic calibre 3285 includes a GMT function and an independently rapid-set hour hand. Rolex lists water resistance to 100 metres (330 feet) and an approximately 70-hour power reserve.
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These are manufacturer specifications, not independent test results. Rolex says that only official Rolex jewelers are allowed to sell and maintain its watches; confirm a seller’s authorized status when considering a purchase.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How to choose between Explorer II generations
For someone comparing references, the key distinction is whether the goal is to understand the model’s original design or to wear a modern version with the travel-time function and current specifications.
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- For the original concept: the 1655 is the first-generation Explorer II, with the linked 24-hour hand described by the specialist chronology.
- For the independent-hour-hand development: the 16550 is the reference the specialist guide identifies with that change, alongside the first Polar dial.
- For a long-running classic-era option: the 16570 spans an approximate 1989–2011 period and was offered in black or white, according to the guide.
- For a larger modern-generation comparison: the 216570 introduced a 42 mm case in 2011; Rolex’s brochure gives calibre 3187 and approximately 48 hours of reserve.
- For the current specification: the 226570 retains the 42 mm case size and uses calibre 3285, with approximately 70 hours of reserve listed by Rolex.
For vintage or pre-owned references, broad chronology cannot establish the production date or originality of a particular watch. A reference guide is useful for comparing generations, but it is not a substitute for a serial-specific assessment.
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