Hamilton Khaki Field Auto 38vsSeiko Prospex SPB143

Both are excellent watches with different strengths. The Hamilton Khaki Field Auto 38 offers a more compact size 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 Hamilton Khaki Field Auto 38 retails for $650–$750, while the Seiko Prospex SPB143 is priced at $700–$900. Pre-owned, expect $500–$650 and $550–$750 respectively. Actual secondary market prices vary based on condition and demand.

The Hamilton Khaki Field Auto 38 has a 38mm case diameter with 10mm thickness, while the Seiko Prospex SPB143 measures 40.5mm × 13.2mm. Both have lug-to-lug measurements of 45mm and 48mm respectively. Consider your wrist size and wear style when deciding.

The Hamilton Khaki Field Auto 38 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 Hamilton Khaki Field Auto 38 uses a automatic H-10 with 80 hours power reserve. The Seiko Prospex SPB143 features a automatic 6R35 with 70 hours power reserve. Both offer traditional mechanical craftsmanship.

Hamilton and Seiko both command strong secondary markets. Pre-owned pricing shows an estimated resale value of $500–$650 for the Khaki Field Auto 38 and $550–$750 for the Prospex SPB143. Condition, service history, and box/papers significantly impact resale value for both models.