Seiko
SPB381J1
Japanese precision, designed for real life.
Signature details
Seiko SPB381J1 Prospex Sea Automatic GMT Diver Watch
SPB381J1 is powered by an automatic GMT with manual winding, built around caliber 6R54 with approximately 72 hours of power reserve; water resistance is rated at 200 m / 660 ft. The additional time-zone function gives SPB381J1 practical depth while preserving the identity of the wider collection.
The details
SPB381J1, at a glance.
Materials and finish
- Crystal
- Sapphire Crystal with Inner Anti-Reflective Coating
Movement
- Movement type
- Automatic GMT with Manual Winding
- Caliber
- 6R54
- Power reserve
- Approx. 72 Hours
- Water resistance
- 200 m / 660 ft Diver's
The movement
6R54
Automatic GMT with Manual Winding
Learn more
The finer details
Full specifications
Seiko SPB381J1 is a new men's watch from the Prospex Sea family, powered by an automatic gmt with manual winding movement. Its balanced specification makes it suitable for regular wear while retaining the defining details of this reference.
The movement specification includes Automatic GMT with Manual Winding; power reserve: Approx. 72 Hours. Exterior and performance details include sapphire crystal with inner anti-reflective coating, 200 m / 660 ft Diver's water resistance.
Movement and functions
- Movement: Automatic GMT with Manual Winding
- Power Reserve: Approx. 72 Hours
Case and dimensions
- Case: Stainless Steel, 42.0 mm
Dial, crystal and display
- Crystal: Sapphire Crystal with Inner Anti-Reflective Coating
Performance and features
- Collection: Prospex Sea
- Calibre: 6R54
- Water Resistance: 200 m / 660 ft Diver's
- EAN / UPC: 4954628249982
Condition and included items
- Condition: New
- Included: Watch, presentation box, supplied manuals and warranty documentation.
Delivery and presentation



Good to know
A few things you might still wonder
Is this watch new?
Yes. This watch is supplied in new condition with its presentation materials.
What is included?
The watch arrives with its presentation box, supplied manuals and warranty documentation.
How should I care for the watch?
Keep the watch clean and dry after wear, follow the manufacturer guidance and service it at the recommended intervals.









