The Rolex Explorer II Ref. 16570 was produced from 1989 to 2011 — a long and considered run that positioned it as one of the most quietly capable references in the modern Rolex catalogue. Where the Explorer I is restraint distilled to its purest form, the Explorer II adds a fixed 24-hour graduated bezel and an independent red GMT hand, allowing the wearer to track a second time zone at a glance. It is a functional watch in the truest sense — developed for cavers, polar explorers, and travellers who needed to distinguish day from night in environments where natural light offered no reliable answer.

This 1991 example carries the black dial configuration — the more dramatic and collector-favoured of the two dial options the 16570 was offered in across its production run. The red GMT hand reads against the black dial and white 24-hour bezel with the kind of clarity that Rolex designed into the reference from its inception. The case appears unpolished, with the factory brushing intact and the surfaces sharp — a notable detail on a watch now approaching thirty-five years of age.