The Rolex Day-Date 40 Reference 228345RBR represents pinnacle of Rolex's dress watch collection combining 18K Everose rose gold construction with exclusive olive green dial diamond-set bezel establishing sophisticated aesthetic appropriate for collectors seeking prestige complications. Introduced as part of Day-Date collection originally launched 1956 establishing first wristwatch displaying both day-of-week fully spelled out and date, model earned unofficial "President" designation after becoming favored timepiece of U.S. presidents world leaders creating association with power success. The 40mm Everose rose gold case introduced 2015 when Rolex replaced Day-Date II (41mm) with refined 40mm proportions creating balanced dimensions appropriate dress watch category. Olive green dial represents Rolex's exploration of distinctive color palettes reserved for precious metal models, green hue creating warm sophisticated appearance enhanced by 18K rose gold Roman numeral hour markers. Bezel set with 48 brilliant-cut diamonds arranged circumferentially creating total approximately 0.80-1.00 carats (exact carat weight varies based on diamond selection), diamonds secured via grain or channel setting. Day display positions at 12 o'clock featuring aperture displaying fully spelled day names available 26 languages, date display positions at 3 o'clock magnified by Cyclops lens characteristic of Rolex Oyster cases. Powered by Caliber 3255 automatic movement introduced 2015 representing significant advancement over previous Caliber 3155: new movement features Chronergy escapement improving efficiency 15 percent, 70-hour power reserve (10 hours more than predecessor), improved accuracy -2/+2 seconds daily exceeding COSC chronometer standards. Iconic President bracelet fabricates entirely from 18K Everose rose gold employing semi-circular three-piece link construction creating distinctive appearance, concealed Crownclasp fold-over deployment ensures seamless aesthetic. Oyster case provides 100 meters water resistance suitable daily wear though Day-Date positioned as formal dress watch rather than sports instrument. Reference 228345RBR combines technical sophistication with precious materials creating timepiece embodying Rolex's commitment to excellence within prestigious Day-Date collection.
The 40mm Oyster case fabricates entirely from 18K Everose rose gold (750/1000 purity) creating Rolex's proprietary rose gold alloy. Everose gold developed 2005 employs slight platinum addition preventing color fading oxidation characteristic of traditional rose gold alloys, ensuring permanent warm pink hue. Monobloc middle case machines from solid Everose gold block creating watertight foundation, case measures 40mm diameter x approximately 12mm thickness providing substantial presence while maintaining dress watch proportions. Bezel set with 48 brilliant-cut diamonds arranged circumferentially creating continuous sparkling frame, diamonds individually selected for color clarity cut quality ensuring uniformity. Diamond setting employs precision techniques securing each stone within bezel maintaining Rolex's stringent quality standards, diamonds protected by bezel's raised profile. Screw-down case back fabricates from Everose gold featuring fluted edge enabling proper sealing, caseback secured via Rolex's proprietary tool ensuring watertight assembly. Screw-down Twinlock crown positions at 3 o'clock featuring double waterproofness system: two sealed zones create watertight barrier protecting movement, crown features Rolex coronet logo. Crown screws down onto case tube creating secure seal, unscrewed position enables winding and time-setting via multiple positions. Sapphire crystal protects dial fabricating from scratch-resistant synthetic sapphire, crystal features Cyclops lens positioned at 3 o'clock magnifying date display 2.5 times improving legibility. Case construction provides 100 meters (10 bar / 330 feet) water resistance suitable handwashing swimming though Day-Date positioned as dress watch. Case finishing employs Rolex's signature combination polished surfaces: case middle lugs crown guards receive mirror polishing creating luxurious reflections, finishing executed to exceptional standards appropriate for precious metal timepiece.
The olive green dial creates sophisticated aesthetic characteristic of Rolex's exclusive color offerings for precious metal models. Dial fabricates from brass receiving multiple lacquer layers creating depth, olive green hue ranging from darker periphery to lighter center creating subtle gradation. Applied hour markers employ 18K rose gold Roman numerals: I II IV V VII VIII X XI creating classical indication, III position replaced by date window IX position partially covered by day display. Roman numerals fabricate from solid rose gold receiving polished surfaces contrasting against green dial. Minute track runs periphery featuring individual minute markers. Rolex coronet logo appears at dial center above 6 o'clock, "ROLEX" signature appears below coronet. "OYSTER PERPETUAL" text appears between coronet and center, "DAY-DATE" text appears below center. "SUPERLATIVE CHRONOMETER OFFICIALLY CERTIFIED" text appears at dial bottom. Day display positions at 12 o'clock featuring curved aperture displaying fully spelled day name: mechanism offers 26 language options including English French German Spanish Italian. Date display positions at 3 o'clock showing date numeral 1-31, Cyclops lens magnifying date 2.5 times. Central hands fabricate from 18K rose gold: hour hand features Mercedes-style design with luminescent fill, minute hand employs stick design with luminescent fill, seconds hand features counterbalanced design. Hands receive Chromalight luminescent coating emitting blue glow lasting up to 8 hours.
Caliber 3255 automatic movement represents Rolex's manufacture development introduced 2015. Movement measures approximately 28.5mm diameter x 6mm height comprising 201 components including 31 jewels. Oscillating 28,800 vibrations per hour (4 Hz) providing enhanced chronometric precision, frequency enables smooth seconds hand sweep. Power reserve delivers 70 hours when fully wound representing significant improvement over previous 3155's 60-hour reserve, extended reserve enables watch continue operating through entire weekend. Bidirectional automatic winding employs Perpetual rotor: rotor fabricates from solid metal swinging both directions exploiting wrist motion, rotor visible would be through caseback though Day-Date features solid caseback. Chronergy escapement represents new design improving energy efficiency 15 percent compared to Swiss lever escapement, escapement fabricates from nickel-phosphorus creating paramagnetic properties. Parachrom hairspring fabricates from paramagnetic niobium-zirconium alloy creating blue coloration, hairspring offers ten times greater shock resistance than traditional hairsprings while remaining unaffected by magnetic fields temperature variations. Paraflex shock absorbers protect balance assembly increasing shock resistance up to 50 percent compared to conventional systems. Oscillator employs Rolex's patented blue Parachrom hairspring with Breguet overcoil ensuring regular breathing concentric development. Balance wheel features variable inertia design with gold Microstella nuts enabling precise rate adjustment, free-sprung balance eliminates traditional regulator index. Day-date mechanism employs complex calendar system: day display operates via disc featuring day names printed 26 languages available, date display operates via standard date disc, both indications change instantaneously at midnight. Quickset functions enable independent adjustment of day and date without affecting time. Movement receives Superlative Chronometer certification: watches tested after casing ensuring -2/+2 seconds daily accuracy exceeding COSC's -4/+6 standard, testing performed across Rolex's range of conditions. Movement decoration employs functional aesthetic: rhodium-plated components, Geneva striping on rotor bridges, polished beveled edges, circular graining.
The President bracelet fabricates entirely from 18K Everose rose gold employing iconic semi-circular three-piece link construction introduced 1956 with original Day-Date. Bracelet features distinctive design: each link comprises three semi-circular elements creating fluid supple feel, links connect via hidden pins creating seamless appearance. Bracelet construction entirely polished creating luxurious reflections throughout, polishing requires extensive hand-work achieving mirror-like surfaces. Bracelet gradually tapers from case toward clasp following traditional proportion though taper subtle maintaining substantial feel. Concealed Crownclasp represents Rolex innovation employing fold-over deployment design: clasp opens via lifting clasp cover revealing folding mechanism, deployment creates secure wearing while maintaining seamless bracelet appearance when closed. Clasp interior engraves with Rolex coronet logo hallmarks establishing authenticity. Clasp features Rolex's patented Easylink comfort extension system enabling 5mm length adjustment without tools, extension particularly useful for temperature-related wrist size fluctuations. Bracelet construction demonstrates Rolex's expertise in precious metal fabrication creating comfortable refined wearing experience appropriate for prestigious Day-Date collection.
The Day-Date 40 228345RBR distinguishes through 18K Everose rose gold case 40mm diameter approximately 12mm thickness, bezel set with 48 brilliant-cut diamonds, olive green dial with subtle gradation, applied 18K rose gold Roman numeral hour markers, day display at 12 o'clock offering 26 languages, date display at 3 o'clock with Cyclops magnification, "ROLEX OYSTER PERPETUAL DAY-DATE SUPERLATIVE CHRONOMETER OFFICIALLY CERTIFIED" text, central rose gold hands with Chromalight luminescent coating, Caliber 3255 automatic movement 28,800 vph 70-hour power reserve, Chronergy escapement improving efficiency 15 percent, Parachrom blue hairspring with Breguet overcoil, Paraflex shock absorbers, variable inertia balance with gold Microstella regulation, instantaneous day-date change at midnight, quickset day-date independent adjustment, Superlative Chronometer certification -2/+2 seconds daily accuracy, screw-down Twinlock crown, sapphire crystal with Cyclops lens, screw-down caseback, 100 meters water resistance, President bracelet entirely 18K Everose rose gold with semi-circular three-piece links, concealed Crownclasp with Easylink 5mm extension. The reference represents Rolex's achievement combining day-date complications with precious materials diamond setting, olive green dial creating distinctive aesthetic within Day-Date collection, Caliber 3255 demonstrating technical advancement, President bracelet maintaining iconic 1956 design, exemplifying synthesis of horological excellence with luxury appropriate for collectors seeking prestige timepiece embodying success sophistication.
