Rolex Datejust 31 - 278243 The Rolex Datejust 31 reference 278243 is a modern interpretation of one of Rolex's most iconic collections. Introduced in 2019, this generation succeeded the previous reference 178243 and brought updated technical features to the 31 mm Datejust. Specifications Brand: Rolex Collection: Datejust Model: Datejust 31 Reference: 278243 Case diameter: 31 mm Case material: Oystersteel and 18-carat yellow gold Rolesor Bezel: Smooth, domed and polished 18-carat yellow gold Dial: White lacquered finish Hour markers: Roman numerals Crystal: Scratch-resistant sapphire crystal with Cyclops lens over the date Movement: Rolex Calibre 2236, self-winding mechanical manufacture movement Escapement: Swiss lever escapement Hairspring: Syloxi silicon hairspring Power reserve: Approximately 55 hours Functions: Hours, minutes, central seconds and date Date display: Date aperture at 3 o’clock with Cyclops lens Precision: Superlative Chronometer, approximately -2/+2 seconds per day after casing Water resistance: 100 metres / 10 bar / 330 ft Crown: Screw-down Twinlock winding crown The Datejust is one of Rolex's most emblematic collections, introduced in 1945 as the world's first self-winding wristwatch with a date window that automatically changed at midnight. Over the decades, it has become one of the brand's defining models, combining timeless proportions with continuous technical development. The reference 278243 was introduced in 2019 as the new generation of the Datejust 31. Its 31 mm Oyster case combines Oystersteel with 18-carat yellow gold, following Rolex's signature Rolesor construction. The smooth, polished yellow-gold bezel provides a refined contrast with the steel case. Shipping: registered and insured, well packaged We ship your package from France but we are a swiss based company. EU customers don't pay taxes. Buyers outside the EU, please check their customs conditions.