1968 Omega Seamaster 300 (Ref. 166.024) "Big Triangle"

There is something about the early vintage Omega Seamasters that truly embodies the golden era of dive watches of the 1960-1970s. Omega has a long history and heritage in dive watches, which date back to the 1930s.  The seahorse adorned case back of the Seamaster series pays tribute to Neptune, the Roman god of the sea. The seahorse logo was conceived by engraver Jean-Pierre Borle.  He was inspired by an image of Neptune driving a chariot pulled by seahorses, which is why the Omega seahorses are depicted wearing bridles.

1969 Omega Seamaster 300 (Ref. 165.024) "Big Triangle" W/ Archive

The reference 166.024 has a specific feeling and look that centers it as one of the most desirable vintage Omega diving watches ever produced by the brand. The bi-directional ratcheting bezel, luminous bezel insert, high visibility dial, and overall larger size for a watch of its time period allow it to remain relevant to today's sizing trends. This Seamaster 300 is exceptional in so many ways. The rare "big triangle" dial, normally seen on military variants of the Seamaster 300, is absolutely gorgeous and unique. 

Stock # OMSM68300-2
Brand Omega
Style Seamaster 300
Model 166.024
Serial 286XXXXX
Size Men's
Material SS
Dial Matte Black "Big Triangle"
Millimeters 42
Bracelet Omega 1039 Bracelet


The impressive twisted lug case retains excellent dimensions and profiling, the case has been lightly polished in the past. The original bakelite bezel is in overall excellent condition, showing some light degradation in the numerals and a  superficial crack right below "20". The screw-down crown is likely original to the watch as the Omega updated the non-screwdown crown to a screw-down crown in 1968 to ensure additional water resistance. The case back retains all of its original factory engravings, though they show slight fading from wear. The era-correct Omega 1039 "flat-link" bracelet is in great overall condition, retaining 21 links that show only moderate stretch from use.


The beloved matte black “big triangle” dial is not only rare but one of the most sought-after dial variants for the Omega Ref. 166.0XX range of Seamaster 300s. This specific dial itself is in exceptional vintage condition, showing only minimal signs of age. The dial has the correct "pin-dots" in the 12 and 6 o'clock markers which are commonly looked for when authenticating big triangle Seamaster 300s. The tritium lume plots have taken on a lovely ivory patina and exhibit no degradation when inspected under U.V. light. The original hands were professionally restored with tritium to match the dial prior to our acquisition.


None. The watch has been recently serviced and is running perfectly, backed by a 1-year warranty on accurate timekeeping.