Design Innovation The Oyster Perpetual Datejust 36 is a defining model in Rolexs history. Introduced in 1945, it was the first wristwatch to feature an automatically changing date display. Its enduring design and technical excellence have made it a cornerstone of the brands collection. Refined Aesthetics This reference, from 2012, features a 36mm case in Oystersteel and white gold, with a gem-set bezel and silver dial adorned with diamond hour markers. Powered by the calibre 3135 automatic movement, it offers approximately 48 hours of power reserve. The Oyster bracelet is fitted with an Easylink extension and Oysterclasp for secure and comfortable wear.