The Explorer II is the Rolex with a job description written for caves. Rolex presented it in 1971 for polar explorers and speleologists, people who cannot tell night from day by looking up21,22. Ref. 16570 is its third generation and by far the longest-running, from 1989 to 20111,2,3.
It is also the last Explorer II at 40 mm, before the line grew to 421,2.
How the Explorer II got here
The first Explorer II, ref. 1655, arrived in 197121,23 with a fixed bezel engraved with 24 hours and a large 24-hour hand, orange on the first watches and red on later ones3,23. It was not a second-time-zone watch: the 24-hour hand was tied to the hour hand, so it worked as a day-and-night indicator1,3,23.
In 1985 ref. 16550 changed that. Its calibre 3085 let the 24-hour hand be set independently, and it brought the first white dial3,6,7,23. Some of those white dials were painted with a paint that aged to cream, and the 16550's markers had white gold surrounds1,7,9.
The 16570 followed in 19891,2,3,5. From the outside it changed little3. Inside, calibre 3185 replaced the 3085, and on the white dial the markers and hands were now outlined in black1,3,4,7.
Twenty-two years of small changes
Rolex did not mark model years, so the changes crept in. The lume went first. Early dials used tritium, marked «SWISS - T<25» below six o'clock; Luminova replaced it in the second half of the 1990s, and Super-LumiNova followed1,2,4,9. For a short period the dial said only «SWISS», then «SWISS MADE»1,4.
The bracelet changed in two steps. Luxury Bazaar lists the 78360 without a safety catch, the 78790 with one from 1997 and the 78790A with solid end links from 20001; Monochrome confirms the move to solid end links, and Teddy Baldassarre dates the flip-lock clasp to 1998–993,4.
The lug holes, drilled through the lugs for the spring bars, disappeared around 2003 to 20041,4,6. Luxury Bazaar calls the hole-free watches 16570T1. Then the rehaut was engraved with ROLEX, dated by sources from 2005 to 20071,2,5, and calibre 3186 replaced the 3185, somewhere between 2005 and 20071,2,3,9.
Inside: calibre 3185 and 3186
Calibre 3185 is built on calibre 3135, with an added 24-hour hand8. It has 31 jewels, runs at 28,800 vibrations an hour and holds about 48 to 50 hours of power reserve, depending on the source1,3,4,8. The local hour hand can be set in one-hour steps, so the red hand can serve as a day-and-night indicator or show a second time zone3,8.
The 3186 kept the design and added a Parachrom hairspring, which the sources credit with better resistance to shocks and magnetism1,4,9. On the 3185, the 24-hour hand wobbles slightly when you set it; on the 3186 the wobble is largely gone1,4,9. Luxury Bazaar's rule of thumb: a plain rehaut means a 3185, an engraved one almost always a 3186, though some early engraved watches still have the 31851.
Polar or black
Both dials are ref. 16570, and both were made through the whole run1,3. Collectors call the white one «Polar»; the black one never got a nickname1.
Dealers agree that the Polar costs more. Bob's Watches puts the pre-owned starting point at about USD 9,500 for white and USD 8,500 for black, and WatchGuys says the white dial carries a slight premium2,6. Chrono24's asking prices mostly agree. Across seven archived copies from January 2024 to October 2025, listings titled Polar or white asked the higher median five times: by under 1 per cent in July 2024, and by 6 to 14 per cent in all four copies from 2025. Black asked slightly more twice, by 2.1 per cent in January 2024 and 1.3 per cent in October 202414,15,16,17,18,19,20. Many listings name no dial colour, so each median rests on only 9 to 23 listings.
A few white dials are collected on their own, such as early «porcelain» dials and dials that aged to cream, but the names rest mainly on one dealer's guide, and sellers stretch them1,7.
What came after
In 2011, the Explorer II's fortieth year, the 216570 replaced the 165701,2,3. Rolex says the watch was restyled that year with a case grown to 42 mm11. It had larger markers and hands, a broader orange 24-hour hand as a tribute to the first 1655s, calibre 3187 and Chromalight lume2,3,7.
In 2021 the 226570 kept 42 mm and moved to calibre 3285, with about 70 hours of power reserve6,7,11.
What it cost, and what it costs
Rolex publishes no historic price list for the 16570, and rolex.com no longer shows it. The best record we found is a US-dollar retail price table that began as a handout a Rolex dealer gave the site's author in 2005 and was later extended by its publisher, Minus4Plus612. Its Explorer II line shows USD 2,750 in September 1992 and USD 6,325 in September 2010, the last figure before the 216570, a rise of 130 per cent in eighteen years12. It is not a Rolex document, and the line names the 1655 and 16570 together, so which generation each year belongs to is our reading of the production years.
Pre-owned, we can measure asking prices. Chrono24 blocks direct reading, so we used archived copies of its 16570 page; the latest is from October 2025, so the figures are a year old. We leave out three listings titled as retailer-signed or as having been on top of Mount Everest, asking USD 57,260 to USD 80,000 in 202415,17. No listing was titled as another reference or as a modified watch.
On that basis, the median asking price on the first page went from USD 7,894.5 in October 2024 to USD 8,123 in October 2025, about 2.9 per cent; counting every listing, it rose 2.5 per cent15,16. The longer window tells a different story: from USD 8,757 in January 2024 it fell to USD 7,395 in January 2025 and recovered only part of the way, down 7.2 per cent over 21 months14,16,18. Asking prices are not sale prices. For sale prices, Bob's Watches reports a median of about USD 9,600 for the 16570 across its own sales from July 2025 to July 2026, up about 10 per cent from the first half of that period to the second13. That is one dealer's sales, not the market.
Buying one pre-owned
A 16570 is at least fifteen years old, so you are buying its history as much as the watch. WatchGuys' list is sensible: matching serial and reference numbers, a dial, hands, bezel and bracelet from the right period, and case edges that have not been polished round. Check the bracelet for stretch, too; WatchGuys says a heavily stretched one can cost over USD 1,000 to replace6. Ask when the watch was last serviced and by whom; WatchGuys puts a Rolex service at USD 800 to 1,200 or more6. Rolex's site also lists Rolex Certified Pre-Owned24; we found no source saying it includes the 16570.
Bob's Watches says older tritium examples generally fetch more than later Super-LumiNova ones2, and Monochrome notes that the bezel's thin polished edge is fragile3.
Nobody can tell you how many 16570s exist: we found no figure from Rolex or anyone else for the reference.
The dubious part
Rolex built the Explorer II for people who spend days at a time in the dark. Most 16570s spend the week in a drawer, which is close enough.
