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The Encyclopedia of Horology

Wristwatch · Diver's wristwatch

Omega Seamaster 300 'Big Triangle' diver's wristwatch, reference 165.024

Partially verified

This circa 1966 Omega Seamaster 300 'Big Triangle' diver's wristwatch, reference 165.024 - 64 SC, features a stainless steel case measuring 42mm in diameter. The black dial displays Arabic numerals at 3, 6, and 9 alongside an oversized triangular luminescent index at 12 o'clock, paired with sword hands and a calibrated rotating bezel. The source reports an automatic Calibre 552 movement and that the watch was catalogued in full working order from a private London collector. It is fitted with an aftermarket black and gold striped NATO fabric strap.

Front view of the Omega Seamaster 300 'Big Triangle' dial, rotating bezel, and stainless steel case on a striped fabric strap
Front view of the Omega Seamaster 300 'Big Triangle' dial, rotating bezel, and stainless steel case on a striped fabric strap — Blenheim Auctions. Rights pending — permission not yet requested. Original source

Catalogue identity

Source
www.the-saleroom.com
Category
Wristwatch · Diver's wristwatch
Maker / attribution
Omega
Reference
165.024 - 64 SC
Catalogue / lot identifier
8
Source-reported date
Circa 1966
Country
Switzerland

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 Exterior Construction

The watch features a stainless steel case with a reported diameter of 42mm, alongside catalogued overall dimensions of 47mm x 42mm. The exterior is fitted with a rotating black bezel marked with elapsed minute graduations and a triangular zero marker.

The timepiece is fitted with an aftermarket black and gold striped NATO fabric strap, as noted in the auction listing and visual inspection.

Evidence for this section
  • “Material Stainless steel”
  • “Case diameter 42mm”
  • “Size: 47mm x 42mm”
  • “Rotating black bezel marked with elapsed minute graduations and a triangular zero marker.”
  • “Bracelet/Strap Aftermarket black and gold striped NATO fabric strap”
  • “Stainless steel case fitted to a striped black and gold fabric NATO strap.”

Dial Configuration and Hands

The black dial displays luminous markers, notably an oversized triangular luminescent index positioned at 12 o'clock alongside Arabic numerals at 3, 6, and 9. Time is displayed using sword-style hour and minute hands accompanied by a central seconds hand.

The auction catalogue identifies this visual design under the model name 'Seamaster 300 "Big Triangle" Professional Diver' with reference number '165.024 - 64 SC'.

Evidence for this section
  • “Black dial features a large triangular luminescent marker at 12 o'clock and Arabic numerals at 3, 6, and 9.”
  • “Sword-style hour and minute hands with a central seconds hand.”
  • “Model Name Seamaster 300 "Big Triangle" Professional Diver”
  • “Reference No 165.024 - 64 SC”

Reported Movement and Provenance

The lot description attributes the timepiece to an automatic Calibre 552 movement and states that it is 'In Full Working Order'. However, internal movement components and the interior of the case back are not visible in the provided imagery, meaning the movement calibre, serial number, and functional status cannot be verified from the photograph.

The entry lists an approximate dating of 'Circa 1966' and notes provenance from a 'Private London Collector', with a claim that the watch was 'cleared on registered loss database'.

Evidence for this section
  • “Calibre Automatic Cal. 552”
  • “In Full Working Order”
  • “Circa 1966”
  • “Private London Collector, cleared on registered loss database.”

Open research questions

  • What movement caliber and serial number are stamped on the internal movement plate to corroborate the seller-reported Calibre 552?
  • Do internal case back references and serial stamps confirm the reference 165.024 - 64 SC and the circa 1966 dating?
  • What type and condition of luminous compound is present on the dial markers and sword hands under ultraviolet light examination?

Source evidence

Recorded claims and source quotations for Omega Seamaster 300 'Big Triangle' diver's wristwatch, reference 165.024
FieldSource-reported valueSource quotation
Reference165.024 - 64 SC“Reference No 165.024 - 64 SC”
CalibreAutomatic Cal. 552“Calibre Automatic Cal. 552”
Case MaterialStainless steel“Material Stainless steel”
Case Diameter42mm“Case diameter 42mm”
StrapAftermarket black and gold striped NATO fabric strap“Bracelet/Strap Aftermarket black and gold striped NATO fabric strap”
Overall Dimensions47mm x 42mm“Size: 47mm x 42mm”
Loss Database StatusCleared on registered loss database“cleared on registered loss database.”

Visible details

  • Black dial features a large triangular luminescent marker at 12 o'clock and Arabic numerals at 3, 6, and 9.
  • Sword-style hour and minute hands with a central seconds hand.
  • Rotating black bezel marked with elapsed minute graduations and a triangular zero marker.
  • Stainless steel case fitted to a striped black and gold fabric NATO strap.

Research qualifications

  • Movement and case back interior are not visible in the photograph.
  • Operational status and internal movement caliber 552 are source-reported and unverified by the image.

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

Consulted source

Omega Seamaster 300 165.024 'Big Triangle' Exceedingly Rare Diver's Wristwatch C 1966The Omega Se

Reviewed 2026-10-21 · Record bc551ea8ea

Terms in this record

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

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