Rolex Datejust 31 Yellow Rolesor — White Roman Dial | Ref. 178243

Reference 178243 belongs to the previous generation of the Datejust 31, identifiable by its 178xxx prefix and the Yellow Rolesor case construction that pairs Oystersteel with 18ct yellow gold on the bezel, crown, and bracelet centre links. The white dial with Roman numerals is a classically proportioned choice that emphasises legibility and formality — Roman hour markers have appeared on Datejust dials since the model's earliest decades, lending a sense of continuity and horological tradition that index or diamond variants cannot replicate.

This reference houses Calibre 2235, the predecessor to the current 2236. It is a self-winding movement with a 48-hour power reserve and parachrom hairspring, certified to COSC chronometer standards. While the 2235 predates the silicon Syloxi hairspring of its successor, it remains a thoroughly capable and reliable movement with decades of proven service. The Yellow Rolesor construction offers visual warmth without the full commitment — and cost — of a solid gold case.

For collectors, reference 178243 occupies interesting ground as a discontinued reference that has now given way to the 278xxx generation. Pre-owned examples represent strong value for money — the Yellow Rolesor aesthetic and Roman numeral dial are perennially appealing, and the price differential between this and a current 278xxx equivalent can be significant. Buyers should verify the bracelet clasp and check for authentic Rolex service records. Those prioritising wearability over collector investment will find this a highly practical choice that presents beautifully in formal or professional settings.