The Rolex Daytona 116520 holds a significant place in the history of Rolex's iconic Daytona collection. Here's a brief overview:

Introduction: The Rolex Daytona 116520 was introduced in 2000. It replaced the reference 16520, which had been in production since 1988. The 116520 marked a significant update in terms of movement and materials.

Caliber 4130 Movement: One of the most notable features of the Daytona 116520 is its movement, the Rolex Caliber 4130. This was Rolex's first in-house chronograph movement, designed and manufactured entirely by Rolex. It replaced the Zenith El Primero-based movement used in the previous references.

Stainless Steel Construction: The Daytona 116520 was predominantly crafted from stainless steel, which was in line with Rolex's tradition of creating durable and reliable timepieces. This made the watch highly sought after by collectors and enthusiasts who appreciated its robustness and classic design.

Cosmograph Daytona: Like its predecessors, the 116520 is part of Rolex's Cosmograph Daytona line, which has a rich heritage associated with motorsports and racing. The Daytona name itself comes from the famous Daytona International Speedway in Florida, USA.

Design: The design of the 116520 remained faithful to the Daytona's iconic aesthetic, featuring a chronograph function with three subdials and a tachymeter scale on the bezel. Its classic yet sporty appearance made it a versatile choice for both formal and casual occasions.

Popularity and Collectibility: Due to its combination of Rolex's renowned craftsmanship, the introduction of an in-house movement, and its association with the prestigious Daytona line, the 116520 became highly popular among watch enthusiasts and collectors. As a result, it has retained its value well on the secondary market, and certain variations, such as those with rare dials or production years, have become particularly sought after.