The Rolex Explorer II, a tool watch designed for exploration and adventure, has a rich and fascinating history. While famously known for its distinct 24-hour hand, a feature crucial for navigating in low-light conditions, a question frequently arises among collectors and enthusiasts: did Rolex ever produce a dateless version of the Explorer II? The answer is nuanced, and delves into the specifics of the reference numbers and the evolution of Rolex's luminescent materials. This article will explore this question, examining the history of the Explorer II, focusing on the rare, transitional period around 1998 when the brand shifted from Tritium to Luminova lume, and clarifying the existence (or lack thereof) of a production dateless Explorer II.
Rolex Explorer II History: A Journey Through Time
The Rolex Explorer II's story begins in 1971 with the introduction of reference 1655. This model, immediately recognizable for its orange 24-hour hand, was designed for spelunkers and explorers who needed to easily differentiate between day and night in challenging environments. The 1655 featured a date function, a relatively standard feature for Rolex watches at the time, and utilized Tritium lume, a radioactive substance that provided strong, long-lasting luminescence. This original Explorer II, with its distinctive aesthetics and robust construction, quickly gained a cult following among adventurers and watch enthusiasts alike.
In 1984, Rolex introduced the reference 16550, marking a significant upgrade. This model retained the core functionality of its predecessor, but incorporated several improvements. The most notable changes were the switch to a sapphire crystal (offering superior scratch resistance) and the adoption of a more legible dial layout. The 16550 also continued to use Tritium lume.
The late 1990s marked a pivotal moment in Rolex’s history, and consequently, the history of the Explorer II. In 1998, Rolex made the decision to phase out Tritium lume in favor of Luminova, a non-radioactive, safer alternative. This transition period is where the mystery of the dateless Explorer II comes into play.
The 16570: A Transitional Reference
The reference 16570, produced between 1989 and 2011, represents a significant chapter in the Explorer II's legacy. This model retained the overall design language of the 16550 but was equipped with the newly introduced Luminova lume. The 16570 is often considered the most desirable reference for many collectors due to its robust build quality, improved luminescence, and the fact that it bridges the gap between the Tritium and the modern SuperLuminova eras.
Crucially, all production 16570 Explorer II models featured a date function. There is no documented evidence, nor any credible anecdotal evidence from reputable sources, to suggest that Rolex ever produced a factory-made dateless version of the 16570, or indeed any production Explorer II reference. Any claims of a dateless Explorer II are likely referring to custom modifications or misunderstandings.
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