Datejust 31mm Steel

The Rolex Datejust Ref. 178240 features a 31mm Oystersteel case with 11.5mm thickness, housing the reliable Calibre 2235 movement. This automatic mechanism operates at 28,800 vibrations per hour with 48-hour power reserve, incorporating 31 jewels and featuring proven Rolex manufacturing excellence with enhanced shock resistance and precision regulation. The movement demonstrates traditional Rolex architecture with bidirectional perpetual rotor and instantaneous date change at midnight.

The black Roman numeral dial displays traditional Roman numerals with railroad minute track creating classic elegance suitable for formal wearing occasions, with date function magnified by Cyclops lens at 3 o'clock. Technical specifications include smooth domed bezel in polished Oystersteel, sapphire crystal with anti-reflective coating, and Twinlock double waterproofness system. The Oyster bracelet features solid link construction with brushed center links and polished outer links, equipped with Oysterclasp folding safety clasp.

Water resistance tested to 100 meters ensures versatility for daily wear while the movement achieves chronometer certification guaranteeing precision within COSC standards. The smooth bezel creates refined aesthetics alternative to traditional fluted bezel design, providing understated elegance. The 31mm case size provides traditional feminine proportions suitable for those preferring classic dimensions with timeless appeal.

This authenticated timepiece exemplifies the Datejust collection's enduring design philosophy with classic proportions and Roman numeral dial elegance. The black dial with Roman numerals creates sophisticated formal character suitable for business and dress occasions. The all-steel construction ensures durability with accessible luxury positioning within Rolex's collection.

Buy this preowned Datejust 31mm Steel on Master Luxury with card and original box at competitive pricing for those seeking classic Rolex proportions with Roman numeral dial distinction.