Rolex Day-Date President 40MM Yellow Gold Fluted Bezel Silver Dial Roman Numeral 228238 The newly introduced perpetual self-winding 3255 caliber with 14 patents, entirely developed and manufactured by Rolex, also sets new standards for resistance to shock and magnetism, power reserve, reliability and ease of use. It features innovations such as the new and more efficient Chronergy escapement, the more resilient blue Parachrom spring in the oscillator, as well as the new-generation Perpetual rotor for more rapid winding. The 40mm 18K yellow gold Oyster case with fluted bezel features scratch-resistant sapphire and Cyclops lens over the date window. With a screw-down case back and Twinlock double waterproofness system for the screw-down crown. The watch is worn on the wrist with an 18K yellow gold President bracelet with semi-circular three-piece links and a concealed deployment Crownclasp. The silver dial features centre hands for hours, minutes, seconds, and day and date in apertures.