The Rolex Cosmograph Daytona reference 16520 was initially launched in 1988 and became the company's first Daytona model to incorporate a self-winding caliber. Rolex chose the dependable Zenith El Primero, acknowledged as one of the best self-winding chronograph movements at that time, as the foundation, which they subsequently upgraded to develop their remarkable cal. 4030. Despite the constraints on production caused by the last out-sourced caliber, the ref. 16520 is currently one of the most popular Daytona models.

With an "S" serial number, this watch is one of the few highly sought-after pieces with "tropical" dials. The “Patrizzi” dial - exemplified by this piece - is without a doubt one of the most attractive and sought-after by collectors. In fact, it can be considered one of the most visually striking dial variations found on the model, merging the rarity and intellectual appeal of a rare dial with the unbridled aesthetic appeal granted by the darkened counters. The three registers have turned into a stunning, deep "chocolate" brown hue. The type of lacquer applied during the manufacturing process has aged over time, and contributed to the unique “tropicalization” of certain S, T and W serial Daytonas' subsidiary dials.

The condition of the case corresponds to that of the dial. Obviously unpolished, hardly ever worn, and still retaining plastic protection ring and green sticker, it could be used to scholarly study how a 16520 case was when it originally left the factory.