Notes: Rolex updated the Day-Date 36 in 2019 with several models. The 128238 is the 18K yellow gold model with a President (3-Link) bracelet with concealed folding Crownclasp. The bezel is fluted.

Mechanism: Originally announced at Baselworld 2015. Rolex claims the new caliber 3255 is two times more precise than an officially certified chronometer. The technology within is protected by 14 patents acquired by “The Crown”. One of the patents includes the Paramagnetic Oscillator with new balance staff that offers enhanced resistance to magnetism.

Rolex is introducing calibre 3255, a new-generation mechanical movement with 14 patents, which sets new standards of performance for the core characteristics of a watch movement: precision, power reserve, reliability, resistance to shocks and magnetism, as well as the ease and convenience of its adjustment.

Calibre 3255’s criteria for precision in everyday wear are twice as exacting as those for an officially certified chronometer. It incorporates the new Chronergy escapement patented by Rolex, which combines high energy efficiency with great dependability. Made of nickel‑phosphorus, it is also insensitive to magnetic interference. The oscillator, the true heart of the watch, has an optimized blue Parachrom hairspring, which is also up to 10 times more precise than a traditional hairspring in case of shocks. Thanks to a new barrel architecture and the escapement’s superior efficiency, the power reserve of calibre 3255 extends to three days. This means the watch will easily continue to run from Friday evening into Monday afternoon even if not worn or wound.

Family Notes: The Rolex Day-Date was introduced in 1956. It soon became known as the "Rolex President". It was unofficially renamed after President Eisenhower became associated with this model watch. This association was made as the watch was known to have been worn by LBJ and shared a scandalous connection to JFK. Since then it has earned the vote of a diverse array of potentates, including Warren Buffett, Jay Z, and (fictional character) Tony Soprano. In 1977, Rolex started using the new (at the time) 3055 movement for the Day-Date/President line. As of 2018, the Day-Date 40 uses the 3255 movement.