The Vintage Omega Seamaster 300: A Diver's Grail and Collector's Icon

There are dive watches, and then there is the Omega Seamaster 300. Introduced in 1957 alongside the Speedmaster and Railmaster as part of Omega's professional "Holy Trinity," the Seamaster 300 was built for one purpose: to work underwater, reliably, at depth. It did that job for military divers, underwater photographers, and professional adventurers across two decades of production. Today, it does something else entirely — it captivates collectors around the world.

This is the story of why, and what you need to know if you want to own one.

Born in 1957

The Seamaster 300 arrived at a moment when Omega was defining what a professional tool watch could be. Water resistance to 300 metres was a remarkable engineering achievement for the era. The watch was built around Omega's calibre 2913 — a robust, reliable automatic movement — housed in a case designed to withstand the crushing pressures of deep water. The dial was functional and uncompromising: large luminous indices on a deep black background, a rotating bezel for tracking dive time, and nothing superfluous.

It was a working instrument. And like all great working instruments, it aged into something beautiful.

What Makes It a Collector's Icon

The Seamaster 300's status in the collector market rests on a combination of factors that are difficult to replicate:

Genuine provenance — this watch earned its reputation in the field, not in an advertising campaign. Military and professional use adds a layer of authenticity that purely commercial watches can't claim.
The "Big Triangle" dial — certain mid-1960s references feature a large triangular index at 12 o'clock that has become one of the most iconic and sought-after details in all of vintage watch collecting. When collectors talk about the Seamaster 300, this is often what they mean.
Dial character — original dials age magnificently. The luminous material develops a warm cream or brown patina over decades that is impossible to fake and deeply desirable to collectors who understand it.
Scarcity — production numbers were modest, and surviving examples in genuinely original condition are increasingly rare. The pool of collector-grade pieces is finite and shrinking.
Horological significance — as one of the watches that defined the professional dive watch category, the Seamaster 300 occupies a pivotal place in watchmaking history.

The References That Matter

The Seamaster 300 evolved through several distinct references during its production life. For collectors, the key references are:

CK 2913 (1957) — the original. Extremely rare, historically significant, and priced accordingly. The starting point of the lineage.
ST 165.014 (mid-1960s) — the reference most collectors dream of. Features the iconic Big Triangle dial and represents the Seamaster 300 at its most desirable.
ST 165.024 (late 1960s) — see below.
ST 166.062 (early 1970s) — the final evolution of the original design before the model was significantly revised. A transitional piece with its own collector following.

The ST 165.024: The Collector's Sweet Spot

Of all the Seamaster 300 references, the ST 165.024 deserves particular attention — and not just because we currently have two exceptional examples in our collection.

The 165.024 represents the Seamaster 300 at its most refined. Produced in the late 1960s, it retains all the design DNA that makes the earlier references so compelling — the deep black dial, the bold luminous indices, the purposeful case proportions — while benefiting from the incremental improvements Omega made through the model's production life. It is, in many ways, the most wearable and liveable of the classic Seamaster 300 references.

What makes our current pair particularly interesting is that one of them features the Canadian variant case — a subtly different case construction produced for the Canadian market that is significantly rarer than the standard reference and highly sought after by serious collectors. The Canadian variant is one of those details that separates the dedicated Seamaster 300 specialist from the casual admirer: less well-known than the Big Triangle dial, but arguably more scarce and, to those who know, just as exciting.

To have both a standard 165.024 and a Canadian variant case example available simultaneously is genuinely unusual. If the ST 165.024 is on your radar — or if it should be — we'd encourage you to get in touch.

What to Look for When Buying

Buying a vintage Seamaster 300 at collector level requires careful attention. The details matter enormously:

Dial originality — this is the single most important factor. An original, unrestored dial — even with honest wear and aged lume — is worth significantly more than a refinished or replaced dial in cosmetically perfect condition. Never let a seller convince you that a "restored" dial is an improvement.
Case condition — unpolished cases with original finishing contrasts are strongly preferred. Heavy polishing rounds off the lug edges and destroys the sharp geometry that defines the watch's character. Some wear is honest; polishing is not.
Bezel insert — original inserts are increasingly scarce. Replacements are common and acceptable, but an original insert in good condition adds meaningful value.
Reference correctness — all components (dial, hands, crown, case) should be correct for the specific reference and production period. Mixed-reference pieces exist and have their own value, but should be priced and described accordingly.
Movement condition — the calibre 2913/2914/591 is a robust movement, but any example of this age should be serviced by a watchmaker experienced with vintage Omega calibres.

The Market Today

The vintage Seamaster 300 market has strengthened considerably over the past decade. Collector awareness has grown, auction results have climbed, and the best examples — particularly Big Triangle references and rare variants in original condition — now command prices that reflect their genuine rarity and desirability. Yet the Seamaster 300 remains more accessible than comparable Rolex dive watches of the same era, making it one of the most compelling propositions in vintage watch collecting: genuine horological significance, extraordinary design, and real investment potential, at a price point that still rewards the knowledgeable buyer.

At Sparklier, we currently have two ST 165.024 examples available — including the rare Canadian variant case. We're always happy to discuss either piece in depth and to share our knowledge of the vintage Omega market with anyone considering a purchase.