Rolex Datejust 36 Oystersteel — Black Index Dial | Ref. 126200

Introduced as part of the 2019 Datejust 36 refresh, reference 126200 represents the steel Datejust in its most elemental specification: Oystersteel case and bracelet, domed bezel, and a black dial with applied index hour markers. This configuration traces a direct line to the Datejust's working origins — conceived not as a jewellery watch but as a precise, durable everyday timepiece for professionals who required date indication with the reliability of an Oyster case. The 36 mm diameter, restored to the collection after the 41 mm and 28 mm variants had attracted separate model designations, re-establishes the original Datejust proportions.

The black dial with index markers is the configuration most associated with the Datejust's utility character. Applied white-gold indices — polished to a mirror finish against the matte black dial lacquer — provide strong legibility in varied lighting conditions. Luminescent material fills both the indices and the baton hands, extending readability into low-light environments. The date aperture at three o'clock with Cyclops magnification is framed with a white-gold surround, maintaining the chromatic palette of the remaining dial elements.

Calibre 3235, fitted to all current Datejust 36 references, represents a generational advance over the 3135 it replaced in this size. Its Chronergy escapement — a patented Rolex design combining a redesigned lever and escape wheel geometry — achieves 15% greater energy efficiency than the conventional Swiss lever, contributing to the movement's 70-hour power reserve. The Parachrom hairspring, manufactured from a proprietary paramagnetic alloy, resists magnetic fields and temperature variation with superior consistency. The three-link Oyster bracelet in Oystersteel with folding Oysterclasp terminates the specification.