The Seiko Prospex Marine Green GMT – SPB381J1 is a rugged yet stylish automatic dive watch with a striking marine-green dial and GMT hand that lets you track a second time zone. It’s powered by Seiko’s in-house Caliber 6R54 movement with approx. 72-hour power reserve and robust 200 m water resistance, making it ideal for both travel and diving. The 42 mm stainless steel case features a sapphire crystal, ceramic bezel and luminous markers for excellent legibility under all conditions. Its design is a modern reinterpretation of Seiko’s iconic 1968 diver’s watch, blending heritage looks with contemporary functionality. The comfortable stainless steel bracelet and practical GMT function make it versatile for everyday wear and adventure alike.
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Movement: Automatic & manual winding, 72-hour power reserve
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Accuracy: +25 / -15 sec per day
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Case: 42mm stainless steel (super hard coating), 12.9mm thick
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Dial: Green, sapphire crystal (AR coating)
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Water Resistance: 20 bar
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Functions: 24-hour hand, Stop seconds
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Features: Lumibrite, unidirectional bezel, screw-down crown & case back
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Band: Stainless steel (hard coating), secure 3-fold clasp with extender
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