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The Encyclopedia of Horology

Wristwatch · Manual-winding chronograph wristwatch

Rolex Oyster Cosmograph Daytona Ref. 6265

Partially verified

This Rolex Oyster Cosmograph Daytona, reference 6265, is a manual-winding stainless steel wristwatch dating to 1975. The watch features a black 'MK2 Sigma' dial, characterized by white subsidiary registers, white printing, and small Greek sigma symbols flanking the 'T SWISS T' signature at six o'clock, which identify the use of white gold for hour markers and hands. The 37 mm Oyster case is equipped with an engraved stainless steel tachymeter bezel and early MK1 screw-down chronograph pushers. It is mounted on a Rolex Oyster bracelet, reference 78350, with 571 end links. Internally, the watch is powered by the manual-winding Rolex calibre 727 movement, based on the Valjoux 72. The auction description reports that the movement has been fully serviced by an experienced professional watchmaker. The dial includes aged tritium hour plots.

Rolex Oyster Cosmograph Daytona Ref. 6265 on wrist, showing the black MK2 Sigma dial, tachymeter bezel, and stainless steel case.
Rolex Oyster Cosmograph Daytona Ref. 6265 on wrist, showing the black MK2 Sigma dial, tachymeter bezel, and stainless steel case. — Bulang & Sons. Rights pending — permission not yet requested. Original source

Catalogue identity

Source
www.bulangandsons.com
Category
Wristwatch · Manual-winding chronograph wristwatch
Maker / attribution
Rolex
Reference
6265
Catalogue / lot identifier
Source URL identifies the listing
Source-reported date
1975
Source-reported place
Switzerland
Source-reported serial
396xxxx

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

Case and Bezel Construction

The 37 mm Oyster case of this reference 6265 is constructed from stainless steel. It features an engraved stainless steel tachymeter bezel, which is described as retaining legible engravings. The case exhibits light signs of wear consistent with its age.

The chronograph functions are operated via early MK1 screw-down pushers, which contribute to the timepiece's appearance. The watch is fitted with an acrylic crystal.

Evidence for this section
  • “The 37 mm Oyster case retains well-defined proportions”
  • “The steel bezel remains attractive, with clearly legible engravings”
  • “Early MK1 screw-down chronograph pushers complete the classic appearance.”

Dial and Hands

The watch is equipped with a MK2 Black Sigma dial, featuring a three-register layout with contrasting white subsidiary registers and white printed text. The dial includes tritium hour plots that show signs of aging.

The presence of small Greek sigma symbols at the six o'clock position, positioned on either side of the 'T SWISS T' signature, indicates that the hour markers and hands are fashioned from white gold. These sigma markings were introduced during the 1970s to denote the use of gold components.

Evidence for this section
  • “At six o'clock, the small Greek sigma symbols flank the T SWISS T signature, indicating the use of precious-metal hour markers and hands, in this case white gold.”
  • “The dial presents beautifully, with finely textured subsidiary registers and warm, gently aged tritium hour plots.”

Movement and Servicing

The timepiece is powered by the manual-winding Rolex calibre 727 movement, which is based on the Valjoux 72 architecture. This calibre is a central component of the late-generation manual-winding Oyster Daytona series.

The auction description reports that the movement has been fully serviced by a professional watchmaker.

Evidence for this section
  • “Inside beats the celebrated manually wound Rolex calibre 727, based on the Valjoux 72 chronograph movement”
  • “fully serviced by an experienced professional watchmaker.”
  • “One-year mechanical warranty”

Open research questions

  • What is the full, unredacted serial number of this specific watch?
  • What specific professional documentation accompanies the reported service?

Source evidence

Recorded claims and source quotations for Rolex Oyster Cosmograph Daytona Ref. 6265
FieldSource-reported valueSource quotation
MakerRolex“Vendor: Rolex”
Reference6265“Rolex Oyster Cosmograph Daytona, Ref. 6265”
Serial396xxxx“Serial 396xxxx”
Date1975“Dating to 1975”
Case materialStainless steel“stainless steel Daytona”
CalibreRolex calibre 727“manually wound Rolex calibre 727”
Bracelet reference78350“Rolex Oyster bracelet reference 78350”
End links571“571 end links”
CrystalAcrylic“acrylic crystal”

Visible details

  • Engraved stainless steel tachymeter bezel
  • Early MK1 screw-down chronograph pushers
  • Sigma symbols flanking T SWISS T signature at six o'clock
  • Oyster bracelet reference 78350 with 571 end links

Research qualifications

  • The exact serial number is partially redacted in the source as 396xxxx
  • The auction description reports the watch has been serviced, but does not provide service records or documentation

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

Consulted source

ساعت مچی Rolex Oyster Cosmograph Daytona رفرنس 6265 با صفحه سیگما

Reviewed 2026-11-02 · Record 27ff722ad0

Terms in this record

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