The Seiko Prospex SPB381J1 Automatic GMT is part of Seiko’s professional-grade Prospex collection, designed for reliability in demanding environments.

Inspired by Seiko’s long-standing heritage in tool watches, this model combines robust construction with refined everyday wearability. The 42mm stainless steel case houses Seiko’s in-house automatic GMT movement, allowing tracking of a second time zone — ideal for travelers and professionals alike.

The deep green dial, paired with a matching rotating bezel, reflects the brand’s tradition of functional yet distinctive design. Lumibrite-coated hands and indices ensure strong legibility in low-light conditions, while the sapphire crystal enhances durability.

Powered by Seiko’s automatic Caliber 6R54 movement, the watch offers approximately 72 hours of power reserve and smooth mechanical performance.

With 200 meters of water resistance and a solid stainless steel bracelet, the SPB381J1 remains true to the Prospex philosophy: professional specifications without sacrificing everyday comfort.

Key Specifications:

• Reference: SPB381J1

• Movement: Automatic (Seiko Caliber 6R54, GMT function)

• Case Size: 42mm

• Case Material: Stainless Steel

• Crystal: Sapphire

• Water Resistance: 200m

• Bracelet: Stainless Steel

• Condition: Brand New

All watches are inspected prior to shipping.