Bearing a “R” case number, the present watch is one of the earliest executions of the reference 16520, Rolex’s first serially manufactured automatic chronograph wristwatch. Likely the most awe-inspiring element of the watch — the rare “Mark I” white porcelain dial exhibits a beautiful luster unmissable by its beholder. With the “Cosmograph” lettering separated from the other four lines of text, the “Floating Cosmograph” design pops out from the gorgeously crafted dial. In addition, the subsidiary dial above the six o'clock features an inverted “6" which looks like a “9”. It is also a tritium dial and is labeled as "T SWISS T" at six o'clock.

The eye is drawn from the dial to the finely preserved stainless steel case which is in immaculate condition, further inspiring awes amongst aesthetes of fine watches. The case features bold proportions and a crisp finish on the case back. Today, the porcelain dial version with R serial has become hugely coveted amongst watch collectors due to its rarity and imposing look. This watch also features a period-correct bezel which is marked until the unit of 200. Accompanied with a Rolex guarantee and box, the present lot is a great addition to any collection.