



Seiko Prospex GMT HBC001J1 1968 Heritage Diver's Watch

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The Seiko HBC001J1 is a high-performance masterpiece that bridges the gap between a rugged saturation diver and a sophisticated travel watch. Featuring a stunning forest green dial and significant improvements over its predecessors—including enhanced water resistance and a state-of-the-art adjustable clasp—this 42mm timepiece is designed to stand out while delivering the absolute precision of the 6R54 GMT movement.
The Seiko HBC001J1 is a high-performance masterpiece that bridges the gap between a rugged saturation diver and a sophisticated travel watch. Featuring a stunning forest green dial and significant improvements over its predecessors—including enhanced water resistance and a state-of-the-art adjustable clasp—this 42mm timepiece is designed to stand out while delivering the absolute precision of the 6R54 GMT movement.
CASE
Case Diameter: 42.0 mm (excluding crown)
Case Thickness: 13.3 mm
Lug-to-Lug: 48.6 mm
Material: Stainless Steel
Crystal: Sapphire Crystal
Dial Color: Green
BAND
Material: Stainless Steel Bracelet
Lug Width: 20.0 mm
Clasp: Latest Generation with 15mm Tool-Free Quick Adjustment
MOVEMENT
Movement: Seiko Cal. 6R54 (Mechanical Automatic)
Power Reserve: 72 Hours
Water Resistance: 300 Meters / 30 Bar
Functions: Date, GMT (Second Time Zone), Hacking, and Hand-winding capacity
CASE
Case Diameter: 42.0 mm (excluding crown)
Case Thickness: 13.3 mm
Lug-to-Lug: 48.6 mm
Material: Stainless Steel
Crystal: Sapphire Crystal
Dial Color: Green
BAND
Material: Stainless Steel Bracelet
Lug Width: 20.0 mm
Clasp: Latest Generation with 15mm Tool-Free Quick Adjustment
MOVEMENT
Movement: Seiko Cal. 6R54 (Mechanical Automatic)
Power Reserve: 72 Hours
Water Resistance: 300 Meters / 30 Bar
Functions: Date, GMT (Second Time Zone), Hacking, and Hand-winding capacity
Notice to Customers:
Orders are dispatched from Singapore.
For customers in the United States:
As of August 29, 2025, all goods imported into the U.S.—regardless of their value—may incur a 10% import duty. This change follows the removal of the de minimis threshold under updated U.S. customs policies.
Please note that customers are responsible for all import duties, taxes, customs charges, and any applicable handling fees.
For information specific to your country’s customs process, including courier fees or tax-free limits, please reach out to our support team.
Notice to Customers:
Orders are dispatched from Singapore.
For customers in the United States:
As of August 29, 2025, all goods imported into the U.S.—regardless of their value—may incur a 10% import duty. This change follows the removal of the de minimis threshold under updated U.S. customs policies.
Please note that customers are responsible for all import duties, taxes, customs charges, and any applicable handling fees.
For information specific to your country’s customs process, including courier fees or tax-free limits, please reach out to our support team.
