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The Encyclopedia of Horology

Wristwatch · Manual-wind wristwatch

Tudor Oyster Ref. 7903 Wristwatch

Partially verified

This Tudor Oyster is a manual-wind wristwatch featuring a 32 mm stainless steel case. The dial is silver-toned, marked with gold-toned markers, pointers, and a sweep seconds hand, and bears the Tudor rose logo. It is powered by a 17-jewel caliber 1156 movement. The case back is marked as an original Oyster case by Rolex Geneva, and the inner case back contains further designations regarding the movement manufacturer and model. The watch is paired with a stainless steel Tudor-signed bracelet. The movement, dial, case, and crown are all signed.

Front view of the Tudor Oyster wristwatch with its original dial and stainless steel bracelet.
Front view of the Tudor Oyster wristwatch with its original dial and stainless steel bracelet. — Ashton-Blakey Vintage Watches. Rights pending — permission not yet requested. Original source

Catalogue identity

Source
ashton-blakey-antiques.com
Category
Wristwatch · Manual-wind wristwatch
Maker / attribution
Tudor
Reference
7903
Catalogue / lot identifier
Source URL identifies the listing
Source-reported date
circa 1960's
Source-reported place
Switzerland
Source-reported serial
128527

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 Dial

The watch features a 32 mm stainless steel case designed in the Oyster style. The outer case back is engraved with the inscription "Original Oyster case by Rolex Geneva," confirming the housing's association with the Rolex Oyster development. The crown is a screw-down type and is signed.

The dial is finished in silver and displays gold-toned indices and hands, including a gold-toned central sweep seconds hand. The signature Tudor Rose logo is positioned on the upper half of the dial, which also carries the "Tudor Oyster" and "Shock-Resisting" text. The watch is fitted with a stainless steel bracelet which bears a Tudor signature.

Evidence for this section
  • “Back of case marked Original Oyster case by Rolex Geneva.”
  • “Diameter of watch is 32 mm.”
  • “Excellent original silver dial with the small TUDOR ROSE logo on this pristine dial.”
  • “Screw down signed Rolex crown.”

Movement and Identification

The watch is powered by a Tudor-signed manual-wind movement designated as caliber 1156. This is a 17-jewel movement. The internal components are visible through the case back, confirming the bridge signatures.

The inner case back is stamped with additional manufacturing details, including "Montres Tudor S.A. Geneva Switzerland" and the reference number 7903. These markings establish the official production identity of the watch as a Tudor-manufactured piece within the wider organizational framework of the brand.

Evidence for this section
  • “17 jewel caliber 1156 manual wind and well running movement.”
  • “Inside back of screw down cover marked Montres Tudor S.A. Geneva Switzerland Patented Stainless Steel 7903 C.R.S.”
  • “Movement, case, dial and crown signed.”

Condition and Attribution

The vendor reports the watch is in good condition with an original dial. The stainless steel bracelet is also described as Tudor-signed and features sufficient link count for adjustments, though minor stretch is noted in the bracelet links.

The production date is attributed to the 1960s. The authentication of the object rests upon the signed components and the documented manufacturer markings on the case, movement, and dial as described in the auction report.

Evidence for this section
  • “Excellent original silver dial with the small TUDOR ROSE logo on this pristine dial.”
  • “Fine condition Tudor signed stainless bracelet with lots of links available on it for a large sized wrist if need be. Minor amount of stretch to bracelet.”
  • “Circa 1960's”

Open research questions

  • What is the specific production range for the 7903 reference?
  • Does the serial number 128527 align with the 1960s dating for the caliber 1156 movement?

Source evidence

Recorded claims and source quotations for Tudor Oyster Ref. 7903 Wristwatch
FieldSource-reported valueSource quotation
MakerTudor“TUDOR by ROLEX”
Reference7903“Ref: 7903”
Movement17 jewel caliber 1156“17 jewel caliber 1156 manual wind”
Case Diameter32 mm“Diameter of watch is 32 mm”
Case MarkingOriginal Oyster case by Rolex Geneva“Back of case marked Original Oyster case by Rolex Geneva.”
Inner Case MarkingMontres Tudor S.A. Geneva Switzerland“Inside back of screw down cover marked Montres Tudor S.A. Geneva Switzerland”
Datecirca 1960's“Circa 1960's”

Visible details

  • Silver-toned dial with Tudor Rose logo
  • Stainless steel oyster-style bracelet
  • 17-jewel manual-wind caliber 1156 movement
  • Signed crown and case back

Research qualifications

  • Movement internal mechanical condition is unverified
  • Bracelet stretch levels are described subjectively

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

Consulted source

ساعت مچی وینتیج Tudor Oyster رفرنس 7903 قاب رولکس

Reviewed 2026-11-02 · Record 68484bf130

Terms in this record

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

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