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The clearest comparison is between the OMEGA Seamaster 300 Heritage and the Vertex M100A—not “the Seamaster” and “Vintage Vertex” as if either name described one watch. Seamaster spans several distinct families, while the M100A is a modern heritage design inspired by a historic Vertex military watch, not an original vintage watch. The two models differ in history, specifications, movement credentials and market-specific pricing; the published specifications alone do not establish a universal winner.
First, identify which watches you mean
OMEGA introduced the Seamaster in 1948, and the name now covers multiple families, including the Diver 300M, Seamaster 300, Aqua Terra and Planet Ocean. Their designs and intended uses vary, so a meaningful comparison needs a specific model. This article uses the Seamaster 300 Heritage, whose Japanese product listing is the source for the specifications below. OMEGA describes its heritage models as tributes to the collection’s history. OMEGA’s Seamaster Heritage Models collection provides that lineage and context.
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“Vintage Vertex” is also ambiguous. It could mean an original historic watch or a current heritage design. The M100A is a modern watch based on the Vertex Cal 59, not a vintage original. Vertex traces its origins to 1912, says it produced military watches including the Cal 59, closed in 1972 and was revived in 2015. The company announced the M100 in 2016. Its history and the M100A listing are on Vertex’s heritage page and M100A product page.
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The figures below are manufacturer-published specifications and prices from regional listings. They describe these particular models and variants, not every Seamaster or Vertex watch.
#1 Best Overall
- Omega Seamaster Automatic Black Dial Men's Watch 210.32.42.20.01.001
| Comparison | OMEGA Seamaster 300 Heritage | Vertex M100A |
|---|---|---|
| Heritage | Current heritage model in a collection introduced in 1948; OMEGA positions its heritage models as tributes to the collection’s history. | Modern tribute to the Vertex Cal 59 military watch; the M100 was announced in 2016 after the brand’s 2015 revival. |
| Case | 41 mm stainless steel. | 40 mm brushed 316L steel; 48.5 mm lug-to-lug and 12.2 mm thick. |
| Movement | Automatic OMEGA Calibre 8912; 60-hour power reserve. | Automatic Sellita SW260-1; the product listing specifies 31 jewels and small seconds. |
| Certification and resistance | METAS Master Chronometer certified; listed as resistant to magnetic fields of 15,000 gauss. | Listed with 100 m water resistance and a five-year guarantee. The cited listing does not establish an equivalent certification. |
| Strap or bracelet | The Japanese listing offers steel-bracelet and leather-strap variants. | The listing includes multiple straps and specifies a 20 mm lug width. |
| Displayed price and market | OMEGA Japan listed the cited steel-bracelet variant at ¥1,089,000 and the leather-strap variant at ¥1,034,000. | Vertex UK listed the M100A at £2,500 including UK VAT. |
Specifications and local listings can change. Check the exact reference, configuration, availability and price in your market before buying. The two displayed prices use different currencies and markets; they are not a like-for-like price ranking.
What the specifications tell you—and what they do not
Size and fit
The case diameters are close: 41 mm for the Seamaster 300 Heritage and 40 mm for the M100A. Diameter alone does not settle how either will wear. Vertex lists the M100A’s 48.5 mm lug-to-lug length and 12.2 mm thickness, but the cited OMEGA product information does not provide corresponding measurements. A full ergonomic comparison therefore cannot be made from these listings. If fit matters, try each watch on or verify the exact reference’s dimensions from its local product details.
Rank #2
- Omega Seamaster Automatic Chronometer Black Dial Men's Watch 210.30.42.20.01.001
Movement and certification
The Seamaster listing identifies Calibre 8912, a 60-hour power reserve, METAS Master Chronometer certification and 15,000-gauss magnetic resistance. Vertex identifies the M100A’s Sellita SW260-1 automatic movement and lists 31 jewels and small seconds. The cited Vertex page does not establish an equivalent certification, so the movements’ published details should not be read as a direct certification comparison.
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Water resistance and intended use
Vertex lists 100 m water resistance for the M100A. That figure is a product specification; it does not establish the present condition of an original vintage Vertex watch. For the Seamaster 300 Heritage, confirm the water-resistance specification for the exact reference and configuration you are considering rather than assuming that all Seamaster models share one rating.
Rank #3
- Model 210.90.42.20.01.001
Straps and configurations
The cited Seamaster listing offers steel-bracelet and leather-strap versions, while Vertex lists multiple straps for the M100A and a 20 mm lug width. If considering another strap, check the exact lug width and spring-bar compatibility rather than relying on the collection name or a visual estimate.
How their histories shape the comparison
The Seamaster’s heritage is the history of a broad OMEGA collection dating to 1948. The M100A draws on a narrower story: Vertex’s military-watch production and the Cal 59. Vertex says it delivered 4,652 Cal 59 W.W.W. watches in 1944; that is the company’s historical claim, not an independently verified production figure. The present M100A is a contemporary interpretation, so buying one is different from acquiring an original military-era Vertex.
The wider Seamaster range also continues to evolve. On October 5, 2026, OMEGA announced a separate Seamaster Diver 300M James Bond and Spectre collection: six 42 mm watches using Calibre 8806, including individual steel editions and limited sets numbered to 77. Those watches are not the Seamaster 300 Heritage compared here. The announcement illustrates why the specific Seamaster family and reference matter. OMEGA’s October 5, 2026 announcement covers that distinct release.
Which one makes more sense for you?
- Choose the Seamaster 300 Heritage as the candidate to investigate if you want this specific OMEGA heritage model, value its listed METAS certification and magnetic-resistance specification, or prefer the bracelet or leather configurations shown in OMEGA Japan’s listing.
- Choose the M100A as the candidate to investigate if you want a modern watch rooted in Vertex’s Cal 59 history, prefer its listed 40 mm case and fully stated lug-to-lug measurement, or want the strap options and 20 mm lug width on Vertex’s product page.
- If you mean an original vintage watch, assess that individual watch rather than applying the M100A’s specifications to it. Condition, originality, service records and current water resistance need to be evaluated for the specific example; no general guarantee about those qualities follows from the modern product listings.
These are decision points, not independent verdicts about accuracy, durability, comfort or ownership cost. The cited product pages provide manufacturer specifications, not comparative testing or a universal winner.
Quick Recap
Best Value
- Model 212.30.44.52.01.001
Sources and current listings
- OMEGA Japan: Seamaster Heritage Models
- Vertex: Heritage
- OMEGA Japan: Seamaster 300 Master Chronometer – Heritage Models
- Vertex: The M100A
- OMEGA Press Room: October 5, 2026 Seamaster Diver 300M announcement
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
