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The Encyclopedia of Horology

Wristwatch · Chronograph wristwatch

OMEGA Speedmaster Reference 105.003 Chronograph Wristwatch

Partially verified

This OMEGA Speedmaster, reference ST105.003, is a manual-wind chronograph wristwatch produced in 1969. Part of the fourth generation of pre-professional Speedmaster models, it is constructed from stainless steel and measures 42mm. The watch is powered by the Calibre 321 manual movement. It features a black matte dial with luminous baton indexes, outer minute and seconds divisions, and an outermost 1/5 second scale. Complications include subsidiary seconds at 9 o'clock, a 30-minute register at 3 o'clock, and a 12-hour register at 6 o'clock, all operated by luminous baton hands and an arrowhead center chronograph hand. The stainless steel case includes a tachymeter bezel and lacks crown guards. The case back is engraved with a hippocampus emblem. The watch is presented on a leather strap.

Front view of the OMEGA Speedmaster reference 105.003, showing the black matte dial with baton indexes and the tachymeter bezel.
Front view of the OMEGA Speedmaster reference 105.003, showing the black matte dial with baton indexes and the tachymeter bezel. — Somlo Antiques. Rights pending — permission not yet requested. Original source

Catalogue identity

Source
somlo.com
Category
Wristwatch · Chronograph wristwatch
Maker / attribution
OMEGA
Reference
ST105.003
Catalogue / lot identifier
Source URL identifies the listing
Source-reported date
1969
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 Bezel

The timepiece features a 42mm stainless steel case. The fixed bezel is fitted with a tachymeter scale insert.

The case back displays an engraved hippocampus logo. According to the provided information, the case back may also feature 'C.H.' initials in a cursive font, though these are not clearly legible in the current images.

Evidence for this section
  • “it was also the last Speedmaster produced without crown guards.”
  • “The case back features the initials C.H. engraved in small cursive font beneath the hippocampus.”

Dial and Complications

The watch features a matte black dial. Hour markers consist of luminous painted baton indexes. The outer periphery includes minute and seconds divisions, with an outermost 1/5 second scale for precise timing.

Sub-dials are arranged for subsidiary seconds at 9 o'clock, a 30-minute recorder at 3 o'clock, and a 12-hour recorder at 6 o'clock. The time is displayed via luminous baton hands, while the chronograph function utilizes an arrowhead center hand.

Evidence for this section
  • “Black matt dial with luminous painted baton indexes”
  • “subsidiary seconds at 9 o’clock, 30 minute register at 3 o’clock and 12 hour register at 6 o’clock with luminous baton hands, and arrowhead centre chronograph seconds”

Historical Context

The reference 105.003 was introduced in 1963. It was selected by NASA in 1965 following testing protocols for official supplier status for astronauts. An example of this reference was worn by astronaut Ed White during a 1965 spacewalk.

Production of the 105.003 continued until 1969, at which point it was superseded by asymmetric-cased references such as the ST105.012 and ST145.012.

Evidence for this section
  • “The reference 105.003 was introduced in 1963 and was the fourth generation of Speedmaster pre-professional models.”
  • “In 1965, The the reference 105.003 was officially selected by NASA.”
  • “NASA astronaut Ed White was wearing a Speedmaster, reference 105.003 during a spacewalk in 1965.”

Open research questions

  • Does the case back carry the specified 'C.H.' engraving mentioned in the source text?
  • Does the current movement serial number align with the 1969 production date?

Source evidence

Recorded claims and source quotations for OMEGA Speedmaster Reference 105.003 Chronograph Wristwatch
FieldSource-reported valueSource quotation
ReferenceST105.003“ST105.003”
Year of production1969“Made 1969”
Calibre321“Calibre: 321”
Case materialStainless steel“Material: Stainless steel”
Case dimensions42mm“Case dimensions: 42mm”
Movement typeManual“Movement: Manual”

Visible details

  • Luminous material applied to dial indexes and hands
  • Tachymeter scale printed on the black bezel insert
  • Engraved hippocampus emblem on the stainless steel case back
  • Three-register chronograph layout

Research qualifications

  • Source notes engraving on the case back, though it is not distinctly visible in the provided photos
  • The leather strap is a replacement and not part of original manufacture

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

Consulted source

ساعت مچی کرنوگراف OMEGA Speedmaster رفرنس 105.003 ساخت 1969

Reviewed 2026-11-02 · Record 278bf707e4

Terms in this record

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

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