Seiko Prospex SPB143vsSeiko 5 Sports SRPE55

Both are excellent watches with different strengths. The Seiko Prospex SPB143 offers a more compact size and costs more new. The Seiko 5 Sports SRPE55 excels in overall construction. The best choice depends on your wrist size, budget, and preferred aesthetic.

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

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

The Seiko Prospex SPB143 is water-resistant to 200m, while the Seiko 5 Sports SRPE55 offers 100m. 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 SPB143 uses a automatic 6R35 with 70 hours power reserve. The Seiko 5 Sports SRPE55 features a automatic 4R36 with 41 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 $550–$750 for the Prospex SPB143 and $180–$280 for the 5 Sports SRPE55. Condition, service history, and box/papers significantly impact resale value for both models.