Seiko Prospex SBDC101vsHalios Seaforth

Both are excellent watches with different strengths. The Seiko Prospex SBDC101 offers a larger case and costs less new. The Halios Seaforth excels in water resistance. The best choice depends on your wrist size, budget, and preferred aesthetic.

The Seiko Prospex SBDC101 retails for $650–$800, while the Halios Seaforth is priced at $850–$1k. Pre-owned, expect $500–$700 and $700–$900 respectively. Actual secondary market prices vary based on condition and demand.

The Seiko Prospex SBDC101 has a 40.5mm case diameter with 13.2mm thickness, while the Halios Seaforth measures 38mm × 11.5mm. Both have lug-to-lug measurements of 48mm and 46mm respectively. Consider your wrist size and wear style when deciding.

The Seiko Prospex SBDC101 is water-resistant to 200m, while the Halios Seaforth offers 300m. 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 Seiko Prospex SBDC101 uses a automatic 6R35 with 70 hours power reserve. The Halios Seaforth features a automatic SW200 with 38 hours power reserve. Both offer traditional mechanical craftsmanship.

Seiko and Halios both command strong secondary markets. Pre-owned pricing shows an estimated resale value of $500–$700 for the Prospex SBDC101 and $700–$900 for the Seaforth. Condition, service history, and box/papers significantly impact resale value for both models.