Skip to content
The Encyclopedia of Horology

Wristwatch · Chronograph

Rolex Daytona Reference 16520

Partially verified

This Rolex Daytona, reference 16520, is a stainless steel automatic chronograph dating from 1993, identified by its 'S' serial number. The timepiece is characterized by its black 'Inverted 6' dial, a detail that distinguishes this variant within the production series. Powering the watch is the Rolex 4030 movement, which originated from a modified Zenith El Primero 400 caliber. The watch features a tachymetric bezel, a sapphire crystal, and an integrated stainless steel Oyster bracelet. The manufacturer updated the reference 16520 to include an increased depth rating of 100 meters (330 feet). The auction description reports that the dial and case are in well-preserved condition. The watch includes the signature 'Daytona' branding on the dial and a crown-signed case back with standard pushers and a screw-down crown system.

Front view of the Rolex Daytona ref. 16520 showing the black 'Inverted 6' dial and stainless steel Oyster bracelet.
Front view of the Rolex Daytona ref. 16520 showing the black 'Inverted 6' dial and stainless steel Oyster bracelet. — Oliver & Clarke. Rights pending — permission not yet requested. Original source

Catalogue identity

Source
oliverandclarke.com
Category
Wristwatch · Chronograph
Maker / attribution
Rolex
Reference
16520
Catalogue / lot identifier
Source URL identifies the listing
Source-reported date
1993
Source-reported place
Switzerland
Source-reported serial
S

Source-reported attribution and specifications are not independent authentication. A listing does not establish present ownership, current display, availability or permission to reproduce.

Object description

Dial and Case Design

The watch displays a black dial featuring three sub-dials with metallic borders. The configuration is distinct for its 'Inverted 6' index located within the six-hour sub-dial. The dial includes the Rolex coronet, brand text, and 'Cosmograph' nomenclature. The layout is completed by applied baton hour markers and an external tachymeter scale printed on the steel bezel.

The case is constructed in stainless steel and remains paired with its original factory-fitted Oyster bracelet. It is equipped with a sapphire crystal, which the source identifies as a technical upgrade for this specific reference to improve durability and water resistance compared to earlier manually-wound Daytona models.

Evidence for this section
  • “The present example is one of the most desirable variants with a black dial, and its very rare Inverted 6 Dial”
  • “incorporated the more resilient sapphire crystals, a contributing factor to the increased depth rating guaranteed at 100m or 330ft.”

Movement and Performance

The reference 16520 utilizes the Rolex 4030 automatic movement. This caliber was derived from the Zenith El Primero 400, a movement Rolex selected when transitioning the Daytona series from manual to automatic winding in 1988.

Rolex performed approximately 200 modifications to the Zenith base to align the movement with company standards. This movement remained in production within this reference for a period of twelve years, serving as the technical basis for the transition to the automatic chronograph era of the Daytona line.

Evidence for this section
  • “Rolex decided to outsource for their movement in this reference using the Zenith 400 movement”
  • “performing approximately 200 modifications to the base movement to meet the expectations prestigious of the brand. This created the workhorse Rolex 4030 movement”

Condition and Identification

The watch is attributed to the year 1993 based on its 'S' serial number. The vendor describes both the dial and the case as being in well-preserved condition.

The documentation provided by the seller addresses potential visual imperfections noted in the photography, clarifying that certain marks or spots visible on the dial are reflections from high-intensity lighting used during the cataloging process rather than physical damage to the watch.

Evidence for this section
  • “1993 ‘S’ Serial Number! The dial itself is in fantastic condition and has an equally well preserved case”
  • “Some marks or spots on the dial are reflections or dust on the crystal and are due to high intensity strobe lighting used while photographing.”

Open research questions

  • Does the 'S' serial number range definitively correspond to 1993 production for this reference?
  • Are there any specific service records or provenance details available for this specific serial number?

Source evidence

Recorded claims and source quotations for Rolex Daytona Reference 16520
FieldSource-reported valueSource quotation
Reference16520“Rolex Daytona Ref. 16520”
MovementRolex 4030“the workhorse Rolex 4030 movement”
SerialS“1993 ‘S’ Serial Number”
Base CaliberZenith 400“the Zenith 400 movement originally manufactured for the Zenith “El-Primero.””
Water Resistance100m / 330ft“increased depth rating guaranteed at 100m or 330ft.”
CrystalSapphire“incorporated the more resilient sapphire crystals”

Visible details

  • Black dial with 'Inverted 6' numeral at the bottom sub-dial
  • Stainless steel Oyster bracelet
  • Tachymeter bezel calibrated to 400 units per hour
  • Screw-down chronograph pushers and central crown

Research qualifications

  • The exact month of manufacture within 1993 is not stated
  • Authenticity of individual internal components is not verified beyond the auction description

Photograph identity and source facts were screened before import; rights clearance remains pending.

Consulted source

ساعت رولکس Rolex Daytona رفرنس 16520 با صفحه مشکی Inverted 6

Reviewed 2026-11-02 · Record 7693148566

Terms in this record

Glossary explanations for terms named in this object’s record.

Other chronograph records