The Rolex Explorer II was introduced in 1971 as the larger, more specialized sibling of the original Explorer model. Designed with the needs of spelunkers in mind, the Explorer II boasts several features that make it a highly capable companion for those venturing into the depths of the Earth. At the heart of the Explorer II ref. 226570 is the automatic caliber 3285 movement, which offers an impressive 70-hour power reserve and is equipped with Rolex's cutting-edge technologies such as the Parachrom hairspring and Chronergy escapement. This ensures the watch is not only accurate but also highly resistant to the rigors of exploration.

The 42mm stainless steel case and fixed steel bezel of the Explorer II make it remarkably durable and shatter-resistant, able to withstand the cramped conditions and potential impacts that come with navigating tight cave systems. The large, legible dial with a prominent orange 24-hour hand allows the wearer to easily track day and night, even in the total darkness of a spelunking expedition. While the Explorer II was originally designed for a niche market, its functionality and robust construction have made it a versatile choice for a wide range of adventurers, from polar explorers to mountaineers. 

The Rolex Explorer II has captivated watch enthusiasts and adventurers alike for its uncompromising functionality, robust construction, timeless design, versatility, and the prestige associated with the Rolex brand. At its core, the Explorer II was built to withstand the rigors of exploration, with features like the 24-hour hand, fixed steel bezel, and high-legibility dial making it an invaluable companion for activities ranging from spelunking to polar expeditions. The stainless steel case and components are engineered to resist impacts, shocks, and environmental stresses, ensuring the watch can keep up with even the most demanding adventures, while the clean lines, balanced proportions, and subtle details create a sense of timelessness that appeals to a wide range of wearers, from seasoned collectors to those seeking their first luxury timepiece - all while carrying the weight of Rolex's storied history and reputation for excellence.

In keeping with Rolex's sports model legacy, the Explorer II has long been a favorite among celebrities and public figures. While both the black and white "Polar" dial variants have seen their share of famous wearers, the Polar Explorer II has undoubtedly been the more popular choice. Celebrities such as Tom Hardy, Prince Harry, Dominic Tuohy, Gordon Ramsay, and John Cena have all been spotted sporting the Polar Explorer II, showcasing its versatile appeal. The Polar's brighter dial and distinctive blackened indices have made it a standout choice among those seeking a casual yet functional Rolex, as evidenced by its prominence in the brand's own advertising campaigns. While the black dial Explorer II has traditionally been less popular than its Polar counterpart, it nonetheless retains a dedicated following, drawing inspiration from the original Explorer II reference 1655 which only came with a black dial.