Rolex Oyster Perpetual Datejust is one of the classic Rolex wristwatches that have stood the test of time and style. Datejust was the first waterproof, self-winding chronometer watch that could display the date in a window at 3 O’clock on the dial. The original Datejust came in a case of 36mm but was further adjusted to 41 mm in the later model. On the other hand, the Lady-Datejust, the original case of 26 mm, was replaced by 28 mm in 2015. However, they are now available in 28mm, 31mm, 34mm, 36mm, and 41mm. Notable figures such as Martin Luther King, Ronald Reagan, and Winston Churchill wore this DateJust. It is available in different materials and colors.