Rolex Explorer II 16570: Unearthing Rare Rail Dials

The Explorer II reference 16570 represents a significant evolution within the Explorer II line, succeeding the 16550 and introducing updated aesthetics and technical refinements. It maintained the core utility of a robust tool watch designed for explorers and those who operate in environments where distinguishing day from night is challenging, thanks to its 24-hour hand and fixed bezel. This reference is often considered a modern classic, bridging the gap between earlier vintage models and contemporary Rolex offerings.

This reference features a 40mm stainless steel case, housing either the Caliber 3185 or later the Caliber 3186 automatic movement, providing a power reserve of approximately 48 hours. It is fitted with a sapphire crystal, enhancing durability and scratch resistance compared to earlier acrylic crystals. The watch offers a water resistance of 100 meters, suitable for everyday wear and light water activities, and is paired with a fixed stainless steel bezel engraved with 24-hour markers.

Appealing to collectors who value a blend of functionality and understated design, the 16570 is available with either a black or white dial, the latter often referred to as the "Polar" dial. Its production run saw the transition between different calibers, which can be a point of interest for enthusiasts. The reference is a practical choice for those seeking a GMT complication in a durable and recognizable form factor, without the rotating bezel found on other GMT models.

The Rolex Explorer II reference 16550 represents a transitional period for the model, bridging the gap between the vintage four-digit references and the modern five-digit iterations. It introduced significant updates while retaining some classic elements. This reference is notable for being the first Explorer II to feature a sapphire crystal and a quickset date function, enhancing its practicality and durability compared to its predecessors. It also marked the introduction of the caliber 3085 movement.

This reference features a 40 mm stainless steel case, characteristic of Rolex's robust sports watches. It is equipped with the automatic caliber 3085, which provides a power reserve of approximately 42 hours. The watch maintains a water resistance of 100 meters and is protected by a sapphire crystal, a key upgrade from the acrylic crystals found on earlier Explorer II models. The fixed 24-hour graduated bezel is also made of stainless steel.

For collectors, the 16550 is particularly appealing due to its transitional nature and the presence of both white and black dial variants. The white dial versions are sometimes referred to as 'cream dials' due to a tendency for the lacquer to age into a creamy patina, making these examples highly sought after. This reference offers a blend of vintage aesthetics with modern technical advancements, making it a significant piece in the Explorer II lineage.