Rolex Day-Date "President" watch, round polished yellow gold case (36mm diameter, 11mm thickness) with screw-down Twinlock winding crown, fluted yellow gold bezel, yellow gold President bracelet with hidden fold-over Crownclasp, dial in your choice of colors, day calendar at 12 o'clock, date calendar at 3 o'clock, 31 jewel caliber 3155 self-winding Oyster Perpetual chronometer movement, scratch-resistant sapphire crystal, water-resistant to 100 meters.Arguably the most recognizable and sought after model that Rolex makes, the Day-Date is generally considered the top of the line in Rolex watches. In keeping with it's unique and prestigious status, the Day-Date is crafted solely in solid precious metals (gold or platinum); and many models are also set with precious gems, including diamonds, rubies, and sapphires. Nicknamed the "President" watch, the Day-Date has long been synonymous with prestige, power, and exclusivity. In 1948, the Chairman of Rolex presented President Eisenhower with an yellow gold Datejust watch, one of the company?s exclusive watches, to celebrate the Allied victory over the Nazis in World War II. However, in 1956, Eisenhower?s watch needed a new bracelet. The new bracelet with a concealed clasp was nicknamed the "President?s bracelet", but soon the Day-Date watch had also been nicknamed the "President watch". Most likely, this is because is the same year the Day-Date watch was introduced.