Elegantly planned and implemented in the middle of the 20th century, the Rolex Datejust, like the Fender Stratocaster and the Porsche 911, has continued in production to this day, more or less in its original form. Similar to the Strat and the 911, the Datejust has evolved with the introduction of new ideas, materials, and technology, while maintaining a fairly stable core design. These businesses have the wisdom to avoid destroying a successful formula.
And yeah, the analogy of the Rolex Datejust being the "Strat" or "911" of watches is spot on. The Datejust has been a staple of the Rolex lineup since its introduction in 1945. Like the Strat and the 911, it now seems so modern and cutting-edge that it is hard to believe it was first introduced more than 70 years ago.