Longines HydroConquest 41vsSeiko Prospex SPB143

Both are excellent watches with different strengths. The Longines HydroConquest 41 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.

The Longines HydroConquest 41 retails for $1k–$2k, while the Seiko Prospex SPB143 is priced at $700–$900. Pre-owned, expect $900–$1k and $550–$750 respectively. Actual secondary market prices vary based on condition and demand.

The Longines HydroConquest 41 has a 41mm case diameter with 12mm thickness, while the Seiko Prospex SPB143 measures 40.5mm × 13.2mm. Both have lug-to-lug measurements of 49mm and 48mm respectively. Consider your wrist size and wear style when deciding.

The Longines HydroConquest 41 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.

The Longines HydroConquest 41 uses a automatic L888.4 with 72 hours power reserve. The Seiko Prospex SPB143 features a automatic 6R35 with 70 hours power reserve. Both offer traditional mechanical craftsmanship.

Longines and Seiko both command strong secondary markets. Pre-owned pricing shows an estimated resale value of $900–$1k for the HydroConquest 41 and $550–$750 for the Prospex SPB143. Condition, service history, and box/papers significantly impact resale value for both models.