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The Encyclopedia of Horology

Wristwatch · Chronograph

Omega Speedmaster Professional Ref. 145.012-68SP Chronograph Wristwatch

Partially verified

This Omega Speedmaster Professional, reference 145.012-68SP, is a manual-wound chronograph wristwatch dating to approximately 1968. It features a stainless steel case measuring 42mm in diameter, paired with an Omega Ref. 1125 stainless steel bracelet and 533 endlinks. The watch is defined by its 'racing dial', which presents a black surface with red baton indexes and matching red hour and minute hands. The dial includes three subsidiary registers and a central chronograph seconds hand. The movement is the manual-wound Caliber 321, equipped with 17 jewels. The exterior is completed by a tachymeter bezel in the 'Dot Over Ninety' (DON) configuration and a screw-down caseback bearing the Speedmaster motif. This specific example is noted as part of a limited group of 'Professional' variants associated with distribution in the United Kingdom.

Front view of the Omega Speedmaster Professional Ref. 145.012-68SP with racing dial and stainless steel bracelet.
Front view of the Omega Speedmaster Professional Ref. 145.012-68SP with racing dial and stainless steel bracelet. — Auction house “Lyon & Turnbull”, via Invaluable. Rights pending — permission not yet requested. Original source

Catalogue identity

Source
orbiscollectibles.com
Category
Wristwatch · Chronograph
Maker / attribution
Omega
Reference
145.012-68SP
Catalogue / lot identifier
Source URL identifies the listing
Source-reported date
circa 1968
Source-reported place
Switzerland
Source-reported serial
26541096

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 is housed in a 42mm stainless steel case. It features a screw-down caseback which is stamped with the signature Speedmaster motif. The dial is the primary feature of this reference, described as a 'racing dial'. It consists of a black surface accented by red baton indexes and matching red hour and minute hands.

The dial layout contains three subsidiary registers for the chronograph functions: a running seconds register, a 30-minute counter, and a 12-hour counter. A central white hand serves as the chronograph seconds indicator. The exterior is fitted with a tachymeter bezel identified by the 'Dot Over Ninety' (DON) configuration.

Evidence for this section
  • “The 42mm stainless steel case includes a screw-down reverse stamped with the signature Speedmaster motif”
  • “features a notable 'racing dial', characterized by its black surface accented with distinctive red baton indexes and matching red hour and minute hands”
  • “fitted with a tachymeter bezel featuring the 'Dot Over Ninety' (DON) configuration.”

Movement and Bracelet

This timepiece is powered by the manual-wound Caliber 321 movement, which incorporates 17 jewels. The movement, dial, and case are all reported as signed by the maker, Omega.

The watch is secured to the wrist by a stainless steel Omega Ref. 1125 bracelet. This bracelet is attached to the watch head using 533 endlinks and terminates in a folding clasp.

Evidence for this section
  • “powered by the manual-wound Caliber 321 movement, comprising 17 jewels.”
  • “presented on a stainless steel Omega Ref. 1125 bracelet with 533 endlinks and a folding clasp.”
  • “The movement, dial, and case are all signed by Omega.”

Provenance and Identification

The watch is identified as reference 145.012-68SP and is dated to approximately 1968. It is stated to be part of a limited known group of 'Professional' examples that feature this racing dial configuration.

These specific examples are historically associated by the source with distribution in the United Kingdom.

Evidence for this section
  • “012-68SP, dates to approximately 1968.”
  • “This specimen is part of a limited known group of 'Professional' examples featuring the racing dial configuration, historically associated with UK distribution.”
  • “Credible evidence exists but classification is not fully established.”

Open research questions

  • What is the specific production range for the 'racing dial' configuration within the 145.012-68SP reference series?
  • What documentation exists from Omega to confirm the UK distribution history of this specific dial variant?

Source evidence

Recorded claims and source quotations for Omega Speedmaster Professional Ref. 145.012-68SP Chronograph Wristwatch
FieldSource-reported valueSource quotation
Reference145.012-68SP“145.012-68SP”
Datecirca 1968“dates to approximately 1968”
MovementCaliber 321, 17 jewel, manual-wound“powered by the manual-wound Caliber 321 movement, comprising 17 jewels”
Case diameter42mm“42mm stainless steel case”
BraceletOmega Ref. 1125“presented on a stainless steel Omega Ref. 1125 bracelet”
Endlinks533“533 endlinks”
Serial number26541096“26541096”

Visible details

  • Red baton indexes and hands on the dial
  • Tachymeter bezel features the Dot Over Ninety (DON) configuration
  • Stainless steel case with screw-down caseback
  • Fitted with a linked bracelet and folding clasp

Research qualifications

  • Classification of the 'racing dial' configuration is described as 'not fully established'
  • Source specifies the example is part of a 'limited known group' rather than a standard model production

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

Consulted source

Omega Speedmaster Professional Ref. 145.012-68SP chronograph wristwatch with 'racing dial'

Reviewed 2026-11-02 · Record 47bc5e0c64

Terms in this record

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

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