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The Encyclopedia of Horology

Wristwatch · Chronograph

Omega Speedmaster Professional Reference 145.022-74

Partially verified

This Omega Speedmaster Professional, reference 145.022-74 ST, is a manually wound chronograph from 1975. The watch features an asymmetrical 42mm stainless steel case with twisted lugs, a black tachymeter bezel, and a matte black dial with three-register layout and luminous hour markers. It is powered by the 17-jewel Omega calibre 861 movement, protected by an inner dust cover. The stainless steel caseback bears the Hippocampus medallion and the NASA flight-qualified inscription. The watch is accompanied by an Omega Extract from the Archives, which confirms the production date of August 27, 1975, and its original delivery to the United States. The watch is mounted on an Omega reference 1171 stainless steel bracelet with 633 end links.

Front view of the 1975 Omega Speedmaster Professional with its accompanying Omega Extract from the Archives document.
Front view of the 1975 Omega Speedmaster Professional with its accompanying Omega Extract from the Archives document. — Ashton-Blakey Vintage Watches. Rights pending — permission not yet requested. Original source

Catalogue identity

Source
ashton-blakey-antiques.com
Category
Wristwatch · Chronograph
Maker / attribution
Omega
Reference
145.022-74
Catalogue / lot identifier
Source URL identifies the listing
Source-reported date
1975
Source-reported place
Switzerland
Source-reported serial
31326XXX

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 an asymmetrical stainless steel case measuring approximately 42mm in diameter, characterized by twisted lugs. The case exterior includes an Omega-signed crown and a black tachymeter bezel with legible markings. The reverse side of the case features a pressed Hippocampus medallion surrounded by text referencing its NASA flight-qualified status.

The dial is finished in matte black with a traditional three-register chronograph layout and white printed scales. The hour markers and hands are applied with luminous material that has developed a warm, aged patina. The dial is enclosed by a crystal, and the interior caseback is stamped with the reference number 145.022-74 ST.

Evidence for this section
  • “retaining the classic asymmetrical stainless steel case, twisted lugs and distinctive tachymeter bezel”
  • “The matte black dial features the traditional three-register chronograph layout, white printed scales and luminous hour markers that have developed an attractive warm patina.”

Movement

Internally, the timepiece is equipped with the Omega calibre 861 movement, a manual-wind chronograph mechanism with 17 jewels. This movement utilizes a cam-operated system and features copper-coloured finishing. It is further protected within the case by an original-style inner dust cover.

The movement serial number is 31326XXX, which the accompanying archive documentation correlates to the production year of 1975. The movement is part of the generation that succeeded the initial Moon-landing era models.

Evidence for this section
  • “the legendary manually wound calibre 861 chronograph movement”
  • “Inside is the Omega calibre 861, a 17-jewel manual-wind chronograph movement with copper-coloured finishing, protected by the original-style inner dust cover.”

Documentation and Provenance

The watch is provided with an official Omega Extract from the Archives, issued on March 12, 2021. This document verifies the watch's production date of August 27, 1975, the original delivery destination of the United States, and confirms the calibre 861 movement and bracelet configuration.

The bracelet is a stainless steel reference 1171 with 633 end links, documented as the original configuration in the archives.

Evidence for this section
  • “official Omega Extract from the Archives, confirming its production on August 27, 1975, and original delivery to the United States”
  • “The watch is fitted with an Omega stainless steel bracelet, reference 1171 with 633 end links, a configuration also recorded in the official Extract from the Archives.”

Open research questions

  • Is there physical evidence on the case or lugs indicating specific past polishing or restoration history beyond normal wear?
  • Does the serial number on the movement exactly match the archival record for the internal casing?

Source evidence

Recorded claims and source quotations for Omega Speedmaster Professional Reference 145.022-74
FieldSource-reported valueSource quotation
Reference145.022-74 ST“145.022-74 ST”
Production DateAugust 27, 1975“production on August 27, 1975”
MovementOmega Calibre 861“Omega calibre 861”
Case DiameterApproximately 42mm“measures approximately 42mm”
BraceletOmega 1171 with 633 end links“reference 1171 with 633 end links”
Movement Serial31326XXX“movement serial number 31326XXX”

Visible details

  • Tritium-style luminous markers exhibit visible patina
  • Case back features stamped NASA flight-qualified inscription
  • Bracelet clasp is signed with Omega logo

Research qualifications

  • Patina on dial markers and hands is consistent with age but not further specified as to material stability
  • Dealer valuation is included in documentation but is not an indicator of current market value

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

Consulted source

ساعت مچی کرنوگراف Omega Speedmaster Professional رفرنس 145.022-74 ST سال ۱۹۷۵

Reviewed 2026-11-02 · Record ef03a4d3ed

Terms in this record

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

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