The Seiko Prospex SPB439J1 is a limited edition reinterpretation of Seiko’s classic 1968 Professional Diver, developed as part of the Save the Ocean series and limited to 1,500 pieces worldwide.

This model combines the rugged performance of a professional dive watch with practical GMT functionality. At its heart lies Seiko’s in-house Caliber 6R54 automatic movement, offering reliable timekeeping, an independently adjustable GMT hand, and an approximate 72-hour power reserve.

The textured dial evokes glacial landscapes, a signature motif of the Save the Ocean collection, and is complemented by strong Lumibrite on the hands and indices for excellent visibility in varied lighting conditions. The ceramic display on the unidirectional rotating bezel adds scratch resistance and premium feel to the timepiece.

Protected by a sapphire crystal with inner anti-reflective coating and built to 200 meters water resistance, the SPB439J1 is suitable for both serious underwater use and everyday wear. The solid screw-down case back is engraved with “Limited Edition” and the watch’s individual serial number.

Perfect for travelers, collectors, and enthusiasts alike, this limited edition GMT highlights Seiko’s mastery of functional design, technical execution, and meaningful storytelling.

Key Specifications

• Reference: SPB439J1

• Movement: Automatic (Seiko Caliber 6R54 with GMT)

• Power Reserve: Approx. 72 hours

• Case Size: 42.0mm

• Case Material: Stainless Steel

• Crystal: Sapphire with inner anti-reflective coating

• Bezel: Unidirectional with ceramic display

• Water Resistance: 200m (Professional Diver’s)

• Bracelet/Strap: Stainless Steel

• Limited Edition: 1,500 pieces

• Condition: Brand New

All watches are carefully inspected prior to shipping.