Omega Seamaster 300m vs Seiko Prospex SPB143
Head-to-head comparison · Community ratings · Pricing
Quick Verdict
Seiko Prospex SPB143 is the value winner at $700–$900 — over 50% cheaper than the Omega Seamaster 300m ($6k–$6k). Choose Omega Seamaster 300m (300m WR) for diving; Seiko Prospex SPB143 (200m) suits everyday wear.
Specifications Compared
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Omega Seamaster 300m
Seiko Prospex SPB143
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Frequently Asked Questions
Which is better: Omega Seamaster 300m or Seiko Prospex SPB143?▼
Both are excellent watches with different strengths. The Omega Seamaster 300m offers a larger case and costs more new. The Seiko Prospex SPB143 excels in overall construction. The best choice depends on your wrist size, budget, and preferred aesthetic.
What's the price difference?▼
The Omega Seamaster 300m retails for $6k–$6k, while the Seiko Prospex SPB143 is priced at $700–$900. Pre-owned, expect $5k–$6k and $550–$750 respectively. Actual secondary market prices vary based on condition and demand.
How do the case sizes compare?▼
The Omega Seamaster 300m has a 42mm case diameter with 13.6mm thickness, while the Seiko Prospex SPB143 measures 40.5mm × 13.2mm. Both have lug-to-lug measurements of 51mm and 48mm respectively. Consider your wrist size and wear style when deciding.
Which has better water resistance?▼
The Omega Seamaster 300m is water-resistant to 300m, while the Seiko Prospex SPB143 offers 200m. 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.
How do the movements compare?▼
The Omega Seamaster 300m uses a automatic Cal. 8800 with 55 hours power reserve. The Seiko Prospex SPB143 features a automatic 6R35 with 70 hours power reserve. Both offer traditional mechanical craftsmanship.
Which holds value better?▼
Omega and Seiko both command strong secondary markets. Pre-owned pricing shows an estimated resale value of $5k–$6k for the Seamaster 300m and $550–$750 for the Prospex SPB143. Condition, service history, and box/papers significantly impact resale value for both models.