
Halios
Seaforth
Ref. SF-BL
New Price
$850–$1k
Pre-owned: $700–$900
Comparing the Halios Seaforth ($850–$1k, 300m WR, 38mm) against the Tudor Pelagos 39 ($4k–$5k, 500m WR, 39mm) — specs, movement, community votes, and an expert verdict below. The Halios Seaforth is the more affordable option by $4k.
Our Verdict
Too Close to Call
Both the Halios Seaforth and Tudor Pelagos 39 are excellent choices — the winner depends on your priorities, budget, and style preference.
Complete head-to-head comparison

Halios
Ref. SF-BL
New Price
$850–$1k
Pre-owned: $700–$900

Tudor
Ref. M25407N
New Price
$4k–$5k
Pre-owned: $4k–$4k
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All Halios watches, comparisons, and guides in one place
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All Tudor watches, comparisons, and guides in one place
Visit Tudor Pillar Page →Halios Seaforth is the value winner at $850–$1k — over 50% cheaper than the Tudor Pelagos 39 ($4k–$5k). Choose Tudor Pelagos 39 (500m WR) for diving; Halios Seaforth (300m) suits everyday wear.
Pros
Pros
Both are excellent watches with different strengths. The Halios Seaforth offers a more compact size and costs less new. The Tudor Pelagos 39 excels in water resistance. The best choice depends on your wrist size, budget, and preferred aesthetic.
The Halios Seaforth retails for $850–$1k, while the Tudor Pelagos 39 is priced at $4k–$5k. Pre-owned, expect $700–$900 and $4k–$4k respectively. Actual secondary market prices vary based on condition and demand.
The Halios Seaforth has a 38mm case diameter with 11.5mm thickness, while the Tudor Pelagos 39 measures 39mm × 12mm. Both have lug-to-lug measurements of 46mm and 46mm respectively. Consider your wrist size and wear style when deciding.
The Halios Seaforth is water-resistant to 300m, while the Tudor Pelagos 39 offers 500m. Both are suitable for swimming and snorkeling at their respective depths. For professional diving, verify the rating exceeds 300m and includes a screw-down crown.
The Halios Seaforth uses a automatic SW200 with 38 hours power reserve. The Tudor Pelagos 39 features a automatic MT5602 with 70 hours power reserve. Both offer traditional mechanical craftsmanship.
Halios and Tudor both command strong secondary markets. Pre-owned pricing shows an estimated resale value of $700–$900 for the Seaforth and $4k–$4k for the Pelagos 39. Condition, service history, and box/papers significantly impact resale value for both models.
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The most recognised watch brand on Earth, producing roughly 1 million watches annually — all in-house.
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The only watch worn on the Moon. The Speedmaster was NASA-qualified in 1965 and accompanied every Apollo mission.
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Motorsport's official timekeeper for over 50 years — TAG Heuer has timed Formula 1, Le Mans, and the Monaco Grand Prix.
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Invented the quartz movement (1969), the kinetic movement (1988), and the spring drive (1999) — more watch innovations than any other single company.
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