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The Encyclopedia of Horology

Wristwatch · Self-winding chronograph

Omega Speedmaster 125 Chronometer

Partially verified

This Omega Speedmaster 125 is a self-winding, water-resistant gentleman's wristwatch, produced in the 1970s. The watch features a tonneau-shaped, three-body stainless steel case measuring 42 x 51 mm, with both polished and brushed surfaces. It is equipped with an integrated stainless steel bracelet and a screwed-down case back adorned with a logo. The flat crystal incorporates an outer tachometer graduation. The black dial contains tritium-coated indexes and a date aperture. Complications include auxiliary dials for the seconds, the 12-hour register, and a 24-hour indicator, along with a 60-minute register operated by a fourth central cross-shaped hand. The movement is the copper-colored Caliber 1041, which is a 22-jewel automatic movement featuring a straight-line lever escapement, a shock absorber, a monometallic balance, and a self-compensating flat balance spring. The movement is adjusted to temperature and five positions.

A front view of the Omega Speedmaster 125 showing the tonneau case, integrated bracelet, and the dial layout.
A front view of the Omega Speedmaster 125 showing the tonneau case, integrated bracelet, and the dial layout. — Antiquorum. Rights pending — permission not yet requested. Original source

Catalogue identity

Source
catalog.antiquorum.swiss
Category
Wristwatch · Self-winding chronograph
Maker / attribution
Omega
Reference
Not recorded
Catalogue / lot identifier
156
Source-reported date
1970s
Source-reported place
Not established

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 Construction

The timepiece is housed in a tonneau-shaped, three-body stainless steel case measuring 42 x 51 mm. The external surfaces of the case are finished with a combination of polished and brushed textures. A screwed-down case back featuring a logo protects the movement. The watch is presented on an integrated stainless steel bracelet.

The black dial includes tritium-coated hour indexes and an aperture for the date. The timekeeping display includes auxiliary dials for the seconds and the 12-hour register, as well as a 24-hour indicator. A 60-minute register is provided by a central cross-shaped hand. A flat crystal is fitted with an outer tachometer graduation.

Evidence for this section
  • “C. three-body, polished and brushed, screwed-down case back with logo”
  • “D. black with tritium-coated indexes”
  • “60 minute registor by means of a fourth cross-shaped central hand”

Movement and Escapement

The watch is powered by the copper-colored Caliber 1041 automatic movement. This movement incorporates 22 jewels and features a straight-line lever escapement. A shock-absorber is fitted to the balance assembly.

The movement employs a monometallic balance paired with a self-compensating flat balance-spring. The Caliber 1041 is adjusted for accuracy across temperature fluctuations and five specific positions. The dial, case, and movement are signed by the manufacturer.

Evidence for this section
  • “M. Cal. 1041, copper-colored, 22 jewels,straight line lever escapement, shock-absorber”
  • “adjusted to tempe-ratures and 5 positions”
  • “Dial, case and movement signed.”

Condition and Attribution

The auction description reports a grading system classification for the timepiece. The overall grade for the lot is listed as Grade A.

The specific components of the watch, including the case, the movement, and the dial, are individually rated as '3 Good' within the auction house's evaluation schema.

Evidence for this section
  • “Grading System Grade: A Good Case: 3 Good Movement: 3 Good Dial: 3”

Open research questions

  • What is the specific serial number of this unit for historical identification?
  • Does the 60-minute register hand function independently of the other chronograph registers?

Source evidence

Recorded claims and source quotations for Omega Speedmaster 125 Chronometer
FieldSource-reported valueSource quotation
MakerOmega“Omega, "Speed-master 125”
Case dimensions42 x 51 mm“Dim. 42 x 51 mm.”
MovementCal. 1041“M. Cal. 1041”
Jewel count22“22 jewels”
Case materialStainless steel“stainless steel gentle-man's wristwatch”
Dial featuresTritium-coated indexes“D. black with tritium-coated indexes”
Movement adjustmentAdjusted to temperatures and 5 positions“adjusted to tempe-ratures and 5 positions”

Visible details

  • Integrated stainless steel bracelet
  • Tonneau-shaped case profile
  • Cross-shaped central chronograph hand
  • Black dial with tritium-coated hour markers

Research qualifications

  • No specific country of origin provided in source
  • Exact production year within the 1970s is not specified

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

Consulted source

Omega, "Speed-master 125", Auto-matic, Chronometer. Produced in the 1970's.Fine, self-winding, water-resistant, tonneau-shaped, stainless steel gentle-man's wristwatch with date, round button chronograph, registers, tacho-meter and integrated stainless steel Omega bracelet.

Reviewed 2026-10-26 · Record 2a3e28eff4

Terms in this record

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

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