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The Encyclopedia of Horology

Wristwatch · Chronograph

Omega Seamaster Chronograph Ref. 145.006-66

Partially verified

This is an Omega Seamaster chronograph wristwatch, reference 145.006-66, dating to circa the 1960s. The stainless steel cushion-shaped round case measures 38 mm across by 43 mm lug-to-lug and features an engraved Seahorse logo on the screw-down caseback. It houses a manual-wind Omega calibre 321 column-wheel chronograph movement with a copper-coloured finish and 17 jewels. The black dial is fitted with three recessed registers for running seconds, 30 minutes, and 12 hours, framed by an outer silvered tachymeter track. It features luminous baton hands and a bright orange central chronograph seconds hand, mounted on a perforated tan leather strap.

Omega Seamaster Chronograph Ref. 145.006-66
Omega Seamaster Chronograph Ref. 145.006-66 — Adam's. Rights pending — permission not yet requested. Original source

Catalogue identity

Source
www.invaluable.com
Category
Wristwatch · Chronograph
Maker / attribution
Omega
Reference
145.006-66
Catalogue / lot identifier
54
Source-reported date
Circa 1960s
Source-reported place
Switzerland
Source-reported serial
26546276

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 Construction

The timepiece is housed in a stainless steel round case measuring 38 mm in diameter, with a lug-to-lug distance of 43 mm. The case features pump-style pushers and a winding crown located at the 3 o'clock position.

The screw-down caseback is engraved with the Seamaster Seahorse logo. The interior of the caseback is stamped with markings identifying the piece as reference 145.006-66 and stating its Swiss origin.

Evidence for this section
  • “Stainless steel round case, screw-down caseback engraved with Seahorse Seamaster logo, inner caseback stamped Omega Watch Co, Swiss Made, ref. 145.006-66.”
  • “Brushed stainless steel cushion-style case flanked by two pump pushers and a winding crown at 3 o'clock.”
  • “38 mm x 43 mm lug to lug.”

Dial and Hands

The black dial contains three subsidiary registers intended for constant seconds, a 30-minute timer, and a 12-hour recorder. It is framed by an outer silvered tachymeter scale.

The watch is fitted with tritium luminous baton hands and an orange central chronograph seconds hand. The dial is signed 'OMEGA Seamaster' and 'T SWISS MADE T' at the base.

Evidence for this section
  • “Black dial with three subsidiary dials for constant seconds, 30-minute and 12-hour registers, applied luminous indexes, tritium luminous baton hands, central chronograph seconds hand in orange, outer silvered tachymeter scale, signed OMEGA Seamaster, T SWISS MADE T.”

Movement and Strap

The watch is powered by a manual-wind Omega calibre 321 movement. It is described as having a copper-coloured finish, 17 jewels, and a column-wheel chronograph mechanism.

The timepiece is presented on a brown perforated leather strap with a steel pin buckle. The catalogue notes that these are not original Omega components.

Evidence for this section
  • “Manual-wind Omega calibre 321, copper-coloured finish, 17 jewels, column wheel chronograph, signed, numbered 26546276”
  • “Brown perforated leather strap with steel pin buckle (not Omega).”

Open research questions

  • Does the serial number 26546276 correspond to a specific production year within the 1960s?
  • What is the extent of professional service required for the calibre 321 movement given the recommendation for overhaul?

Source evidence

Recorded claims and source quotations for Omega Seamaster Chronograph Ref. 145.006-66
FieldSource-reported valueSource quotation
Reference145.006-66“ref. 145.006-66”
CalibreOmega calibre 321“Manual-wind Omega calibre 321, copper-coloured finish, 17 jewels, column wheel chronograph”
Movement Number26546276“numbered 26546276”
Case Dimensions38 mm x 43 mm lug to lug“38 mm x 43 mm lug to lug.”
Dial SignatureOMEGA Seamaster, T SWISS MADE T“signed OMEGA Seamaster, T SWISS MADE T.”
Estimated Era1960s“circa 1960s.”

Visible details

  • Black dial featuring three subsidiary counters and an outer silvered tachymeter scale ring.
  • Prominent straight orange central chronograph hand.
  • Brushed stainless steel cushion-style case flanked by two pump pushers and a winding crown at 3 o'clock.
  • Perforated brown leather rally-style strap secured with white contrast stitching.

Research qualifications

  • Strap and buckle are noted in the catalogue as non-Omega replacements.
  • Movement and caseback interior are not visible in the presented photograph.

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

Consulted source

Sold at Auction: OMEGA REF. 145.006-66, SEAMASTER CHRONOGRAPH, CAL. 321, STEEL A fine and attractive stainless steel chronograph wristwatch with black dial and tachymeter scale, circa 1960s. Year: Circa 1960s Dial: Black dial with three subsidiary dials for c

Reviewed 2026-10-26 · Record c2f8994165

Terms in this record

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

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