Seiko Prospex SBDC101vsSeiko Prospex SPB143

Both are excellent watches with different strengths. The Seiko Prospex SBDC101 offers comparable sizing and costs less new. The Seiko Prospex SPB143 excels in overall construction. The best choice depends on your wrist size, budget, and preferred aesthetic.

The Seiko Prospex SBDC101 retails for $650–$800, while the Seiko Prospex SPB143 is priced at $700–$900. Pre-owned, expect $500–$700 and $550–$750 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 Seiko Prospex SPB143 measures 40.5mm × 13.2mm. Both have lug-to-lug measurements of 48mm and 48mm respectively. Consider your wrist size and wear style when deciding.

The Seiko Prospex SBDC101 is water-resistant to 200m, 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.

The Seiko Prospex SBDC101 uses a automatic 6R35 with 70 hours power reserve. The Seiko Prospex SPB143 features a automatic 6R35 with 70 hours power reserve. Both offer traditional mechanical craftsmanship.

Seiko and Seiko both command strong secondary markets. Pre-owned pricing shows an estimated resale value of $500–$700 for the Prospex SBDC101 and $550–$750 for the Prospex SPB143. Condition, service history, and box/papers significantly impact resale value for both models.