The Explorer II is perhaps the most specialized sports Rolex ever produced—originally designed for cave explorers, or spelunkers, who could spend extended periods without natural light. Its fixed 24-hour bezel and additional 24-hour hand allow the wearer to distinguish day from night, a function that once served a very real purpose.
This example features the striking white “Polar” dial, giving the watch a distinctive and highly legible appearance. The contrast of black hour markers, hands, and bezel numerals against the crisp white background creates a clean, almost graphic look, while the red 24-hour hand adds just the right amount of visual tension.
 
The reference 16570 represents a now-discontinued era of Rolex sports watches—simple, functional, and perfectly proportioned. With its 40mm Oyster case, it wears comfortably on a wide range of wrists, offering a more traditional feel compared to modern counterparts. At the same time, it benefits from the reliability and robustness of late 20th-century Rolex engineering.
 
A versatile and increasingly appreciated reference—practical, balanced, and unmistakably Rolex.