Omega Seamaster Big Triangle 300 ST 166.024 with Omega box and Extract of the Archive

Omega Seamaster Big Triangle 300 ST 166.024 with Omega box and Extract of the Archive

Model: Seamaster 300
Reference: 166.024-67
Gender: male/uni-sex
Year: 1969
Material: stainless steel
Dial Color: Black
Dimensions: 42 mm
Watch Movement: automatic
Bracelet/Strap: steel bracelet
Box/Paper: Original box and extract of the archive
Condition: Excellent

Omega Seamaster Big Triangle 300 ST 166.024 with original box

WRIST ICONS is proud to present one of the real diving icons. This is an opportunity to acquire an original Omega Seamaster 300 ST 166.024-67 with a 1039 bracelet and a really rare original box. This Omega Semaster is nick-named the Big Triangle!

The Seamaster 300 is a watch that has been used by the British Ministry of Defense and Jacques Cousteau! It is also a watch that has been faked by many and these watches are often modified to look like a Milspec watch. To get a Big Triangle in a real honest condition with its original box is just a treat.

What is not to love on the design of this iconic Omega Seamaster Big Triangle?

According to the extract of the Archive this example has been produced on November 25th of 1969 and has been delivered to France. You can rock this watch with its beautiful flat link bracelet or go casual and wear it with a WRIST ICONS premium NATO seatbelt strap.

History of the Omega Seamaster

In 1932 Omega had launched their first real divers watch the rectangular Marine Master. And the expertise and designs from that watch were carried forward to create the first Omega Seamaster 300. Launched in 1948 to coincide with Omega’s centenary, the Seamaster is Omega’s most veteran line in the current collection and the granddaddy of Omega’s powerful family of diving instruments -including the Seamaster Diver 300m Bond watch. As the direct descendant of Omega’s utilitarian wristwatches supplied in bulk to the British Ministry of Defense during WWII, the Seamaster was the civilian answer to the robust models designed to resist the most grueling conditions imaginable.

 René Bannwart is considered the father of the Omega Seamaster line. The man who would later found Corum had begun building Omega’s design department in 1940. This was new. At that time, sketches for new models were usually drawn by draftsmen in watch-case factories. Bannwart’s decision set Omega on a new path that other brands would soon follow. To celebrate Omega’s 100th anniversary, Omega sales director Adolphe Vallat asked Bannwart to develop a sporty, robust and waterproof wristwatch. Bannwart felt that Vallat wasn’t giving him enough time, so he presented one of his case designs with the comment “much too clunky.” To Bannwart’s surprise, Vallat was delighted. The result was the Seamaster family. It had its origins in watches supplied to Britain’s Royal Air Force in World War II. The 1948 civilian version of the pilots’ watch had a water-resistant case (to 50 meters), a screwed caseback with lead gaskets, a reinforced crystal, a silvered dial, and polished and riveted Arabic numerals.

The first Omega Seamaster was modeled after the waterproof wristwatches made for and worn by the British military during World War II. What distinguished the Seamaster from its diving watch predecessors was its O-ring gasket which improved its water-resistance. Previously water-resistant watches relied on lead or shellac gaskets which were easily affected by temperature changes like those a diver would experience at various depths. Omega turned to the submarines used during WWII for inspiration and included a resilient rubber gasket in the Seamaster’s final design. This new case remained intact at depths up to 60 meters and temperature ranges between -40 degrees and 50 degrees Celsius.


Omega engineers was so confident of the Seamaster’s durability, they attached one to the outside of an aircraft and flew it over the North Pole in 1956.

In 1957 the world was greeted by the arrival of Omega’s famous broad arrow trilogy: Speedmaster, Railmaster and importantly the Seamaster 300. The Seamaster 300 was Omega’s first true divers watch. The watch was guaranteed to 200m although tests equivalent to 300m have been carried out without water ingress, hence the rear of the watch carried the title ‘certified high pressure waterproof Seamaster’. This watch was designated the CK2913 which was replaced in 1960 by CK14.755 (calibre 552) The CK14.755 reference did not have the “broad arrow” hands and also used a different movement (Caliber 552).

In 1962 came the second generation of the Seamaster 300 which then became ST165.014 and thereafter refrence ST165.024 in 1963-64. The watch using a crown and dial variation complied with the Ministry of Defence DEF STAN 66 guidelines and was issued to all sectors of the British Army. Jacques Cousteau and his team used the Omega Seamaster 165.024 during the under water experiment Precontinent II that was conducted in the Red Sea in July 1963.

Although the Omega Vintage website states the SM300 was in their International Collection from 1962 - 1969 it probably did not reach the dealers until 1964. It was available either with a metal bracelet or leather strap.


Now let’s dive into the technical details of this caliber.

Initially the SM300 was available as non-date watch with a center sweep second hand. The majority of non US watches used an Omega cal.552 movement with 24 jewels created in 1958. The Omega cal.550 movement with 17 jewels created in 1960 was chosen specifically for the American market, as watches that exceeded 17 jewels were subject to more tax in the US. The compromise was made in the automatic assembly, where brass bushes were used instead of jewels. The brass bushes were prone to wear, and it is not uncommon to see cal.550 movements that have had both the upper and lower automatic bridges changed to the jeweled version.

The date version was introduced in 1967 as case reference 166.024 and used an Omega cal.565 movement with 24 jewels created in 1965.

The SM300 name suggests it to be waterproof to 300 meters but the Omega Vintage website and period catalogues list it as waterproof to 660 feet or 200 meters.

This particular Omega Seamaster 300M has just undergone a full service. This work was carried out by an Omega Service Center certified watchmaker using original parts.

As with all of our pre-owned watches this watch comes with a full 12 month WRIST ICONS warranty that will be invoked from the day of purchase. Further: everything is cleaned before sending the items.

  • Brand: Omega
  • Model: Seamaster 300
  • Reference: 166.024-67
  • Calibre: calibre 565 automatic movement with date function, 24 jewels, frequency 19800 A/h, power reserve: 46 hours
  • Movement No: 27.5851xx signed Omega
  • Case: It has a polished stainless steel water resistant case made by Huguenin S.A. Le Locle-Suisse with screw down case back with several hallmarks OMEGA WATCH Co FAB SUISSE SWISS MADE ACIER STAYBRITE (steel supplier) HF 166024-67 SC and an original screw down Omega crown.
  • Dimensions: 35mm diameter;
  • Bezel: comes with the original bezel only delivered on models from 1969-71 with heavy set text with rounded corner triangle
  • Crystal: Plexiglass
  • Dial: a very nice black dial with big triangle shaped luminous hour markers with luminous,  white outer minute polished , big luminous SWORD hands and center seconds, Diamond second hand with a long point, date aperture at 3 with all original details open loop 6, open loop, white outline around the date window
  • No lining visible at the edge of the hour markers.
  • Crystal: Original Acrylic w/Omega Logo in
  • Bracelet/Strap: fitted on a Omega period correct 1039 ladder bracelet with correct 516 end links
  • Lug Width: 20mm
  • Box/Papers: comes with Extract of the Archive, blank guarantee booklet and really rare  original Seamaster 300m case
  • Condition: Pre-owned. Excellent condition with some light signs of wear to case and crystal.




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