ROLEX COSMOGRAPH DAYTONA REF.16520

Brand

Model

Reference No.

Serial number

Year

Movement

Case

Dial

Crystal

Bracelet

Functions

Production

Caliber

Accessories

Description

Rolex

Cosmograph Daytona

16520

E9xxxxx

1991

Zenith El Primero 4030 automatico

Acciaio inox 40 mm

Bianco laccato (non porcellana), “Inverted 6”

Zaffiro

Oyster in acciaio con depl

Ore, minuti, piccoli secondi, cronografo

1991

Caliber 4030, Automatic

Original Box, Papers, and Booklets

This Rolex Daytona ref. 16520, E9 serial from 1991, is one of the most desirable configurations of the Zenith-powered automatic model. It features a white lacquered dial (not porcelain, reported on the Mondani Daytona book), part of the series with the notable “inverted 6” – where the numeral 6 on the 12-hour chronograph sub-dial is not radially flipped, thus appearing as a 9 when worn on the wrist.

The bezel still displays the 400 units per hour scale, but in this updated version, it features the 240 marking instead of the earlier 250 and 225.

This configuration is highly sought after by collectors, both for its transitional technical details and the visual elegance of the lacquered dial, which mimics porcelain but is distinct in material. A historically significant example in the evolution of the automatic Daytona line.