Daylight Below Ground: The 1996 Rolex Explorer II 16570 ‘Polar’

Drop into a windowless cave with this 1996 Rolex Explorer II 16570 on the wrist and the bright red 24-hour hand still tells you whether the sun is up outside, which is the exact problem the white Polar dial was built to solve. This is the third generation of the Explorer II, a 40mm watch in brushed stainless steel with a fixed 24-hour bezel and a sapphire crystal, made during the tritium years of the long-running 16570 line. The example here pairs that mid-1990s case with a later Swiss Only service dial, a detail worth understanding in full, and one we will come to.

From Everest to the Underworld: The Explorer Bloodline

Rolex built its tool-watch reputation on the Oyster case, the screw-down waterproof design Hans Wilsdorf patented in 1926, and the Explorer name grew directly out of that ethos. The first Explorer celebrated the 1953 conquest of Everest and was made for cold, altitude and abuse. The Explorer II arrived in 1971 as reference 1655, a more specialised instrument fitted with a fixed 24-hour bezel and a large arrow-shaped 24-hour hand that earned it the Italian nickname Freccione. Its purpose was unusual and precise. For cavers and speleologists working underground for days at a stretch, sunlight gives no clue to the hour, so the 24-hour hand and bezel let the wearer read whether it was morning or midnight at a glance. The Explorer II carried that logic forward through the 16550 of 1985, the first to offer the white Polar dial, and into the 16570 that replaced it in 1989.

The Reference 16570 and the Caliber 3185

The 16570 enjoyed the longest run of any Explorer II, spanning from 1989 to 2011 before the larger 42mm 216570 took over. It was the first Explorer II with a sapphire crystal and, in hindsight, the last to keep the compact 40mm case and the stamped clasp that give it such an honest, mid-period character. A 1996 example like this one sits firmly in the early tritium era of the reference and runs the Rolex Caliber 3185, an automatic chronometer movement beating at 28,800 vibrations per hour with a power reserve close to two days. The 3185 lets the wearer jump the local hour hand independently in one-hour steps without stopping the seconds, turning the fixed bezel and 24-hour hand into a genuine dual-time display for travel as much as for caving. It carries one charming period quirk, a slight wobble of the 24-hour hand when the local time is adjusted, which Rolex only smoothed away with the later Caliber 3186 after 2007. The case is cut from corrosion-resistant 904L stainless steel and rated to 100 metres, and earlier production years such as this one wear drilled lug holes that make strap changes simple.

Reading the Polar Dial

Polar is the collector shorthand for the white-dialled Explorer II, and it is the more distinctive of the two colours Rolex offered. Against the white field, the hour markers and hands are finished in black rather than the plain steel surrounds you might expect, a contrast that makes the dial unusually crisp and instantly legible. The red 24-hour hand sweeps across that bright surface as the watch’s single flash of colour, a direct visual link back to the original 1655. Very few sports Rolex models wear white at all, which is a large part of why the Polar holds such a particular place in the catalogue and why the 16570 Polar remains one of the most recognisable faces in vintage Rolex.

Understanding the Swiss Only Service Dial

The fine print at the base of the dial records how Rolex lit its watches in the dark, and that text changed three times across the life of the 16570. Through the early years, including 1996, dials were marked SWISS - T<25 to denote tritium lume sitting beneath black-coated white gold surrounds. In 1998 Rolex moved to non-radioactive Luminova and printed simply SWISS at six o’clock, the brief transitional marking collectors call Swiss Only, before settling on SWISS MADE with Super-LumiNova from 1999 onward. The dial fitted to this 1996 Polar is a Swiss Only service dial, meaning Rolex replaced the original during a later service with a Luminova example bearing that short-lived signature. It is an honest piece of the watch’s working history, and it reads beautifully, the white field and black markers as sharp and clean as the day the watch left Geneva.

Final Thoughts

The 1996 Rolex Explorer II 16570 Polar is the kind of watch that rewards knowing exactly what you are looking at. It is a true tool design with a clear purpose, born from cave exploration and refined across half a century, wrapped in a 40mm steel case that feels right on almost any wrist. The Caliber 3185, the red 24-hour hand and the crisp Polar dial carry the full weight of the Explorer story, while the Swiss Only service dial adds a small, traceable chapter of its own. This is vintage Rolex at its most useful and least shouty, and that quiet confidence is exactly why the 16570 Polar endures.

• The case remains in great condition - lightly polished 
• Bracelet in great condition

• Dial & hands very good