March 15, 2026
Brand: Rolex
Model: Daytona Ref.16520
Year: 1995
Case: 40mm
Material: Steel
Dial: Black "Patrizzi"
Functions: Chronograph
Movement: 4030 Automatic
Bracelet/Strap: Steel Bracelet
Accessories: Original Box & Papers
Warranty: 24 Months
The Rolex Cosmograph Daytona "Patrizzi" is a rare variant of Ref. 16520 produced between 1994 and 1995. It has become legendary among enthusiasts and collectors due to a manufacturing defect that, over time, has significantly increased its appeal and rarity. The nickname “Patrizzi” comes from Osvaldo Patrizzi, one of the world’s leading experts in watchmaking - and Rolex in particular - and the founder of the auction house Antiquorum, who was the first to identify this defect. As a result of this anomaly, the chronograph sub-dial rings, originally white, gradually turn brown or even black over time.
This distinctive discoloration is caused by the use of a specific protective lacquer applied to the rings, known as Zapon. However, this coating does not adequately protect the sub-dials from oxidation caused by humidity and UV exposure, leading to a progressive change in color. Rolex quickly corrected the issue, but not before a number of Ref. 16520 examples had entered the market. Today, these watches are highly sought after, particularly because the degree of patina varies from light brown to almost completely black, making each piece effectively unique. Moreover, the color change does not stabilize and continues to evolve as the watch ages.
The example offered here dates to 1995 and features the classic 40 mm stainless-steel case paired with an Oyster bracelet, both in excellent condition. Inside beats the automatic calibre 4030, based on Zenith’s El Primero calibre 400, which Rolex extensively reworked with over 200 modifications—both aesthetic and functional—including a reduction in the balance frequency from 36,000 to 28,800 vibrations per hour, representing approximately 50% of the movement’s components. The watch is offered full set.