Seiko 5 Sports SRPE55vsSeiko Prospex SPB143

Both are excellent watches with different strengths. The Seiko 5 Sports SRPE55 offers a larger case and costs less new. The Seiko Prospex SPB143 excels in water resistance. The best choice depends on your wrist size, budget, and preferred aesthetic.

The Seiko 5 Sports SRPE55 retails for $250–$350, while the Seiko Prospex SPB143 is priced at $700–$900. Pre-owned, expect $180–$280 and $550–$750 respectively. Actual secondary market prices vary based on condition and demand.

The Seiko 5 Sports SRPE55 has a 42.5mm case diameter with 13.4mm thickness, while the Seiko Prospex SPB143 measures 40.5mm × 13.2mm. Both have lug-to-lug measurements of 50mm and 48mm respectively. Consider your wrist size and wear style when deciding.

The Seiko 5 Sports SRPE55 is water-resistant to 100m, 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 5 Sports SRPE55 uses a automatic 4R36 with 41 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 $180–$280 for the 5 Sports SRPE55 and $550–$750 for the Prospex SPB143. Condition, service history, and box/papers significantly impact resale value for both models.