



Seiko Astron Nexter Dual-Time Chronograph SSH155J1 Watch

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The Seiko Astron SSH155J1 represents the frontier of advanced global timekeeping. Combining a high-contrast dark dial with a sleek ceramic-titanium bezel, this flagship 43.3mm luxury chronograph is built for those who demand absolute temporal control across borders. Powered perpetually by any light source, it syncs with GPS satellites anywhere on Earth to deliver atomic clock accuracy alongside a premium, lightweight feel.
The Seiko Astron SSH155J1 represents the frontier of advanced global timekeeping. Combining a high-contrast dark dial with a sleek ceramic-titanium bezel, this flagship 43.3mm luxury chronograph is built for those who demand absolute temporal control across borders. Powered perpetually by any light source, it syncs with GPS satellites anywhere on Earth to deliver atomic clock accuracy alongside a premium, lightweight feel.
CASE
Case Diameter: 42.0 mm
Case Thickness: 12.0 mm
Case Length (Lug-to-Lug): 47.9 mm
Material: Titanium with Super-Hard Coating
Bezel: Two-Layer Titanium/Aluminum with Cutout Indexes
Crystal: Sapphire Crystal (Super-Clear Coating)
BAND
Material: Titanium with Super-Hard Coating (Chamfered Links)
Lug Width: Integrated
Clasp: Three-Fold Clasp with Push-Button Release and Smart Adjuster Function
MOVEMENT
Movement: Caliber 3X62 GPS Solar Powered
Accuracy: GPS satellite synchronization ($\pm$15 seconds per month without a satellite signal)
Power Reserve: Approximately 6 Months on a full charge (Perpetual operation through ambient light)Water Resistance: 100 Meters / 10 Bar
Luminous: High-grade LumiBrite on hands and indexes
Functions: GPS signal reception indicator, multi-functional indicator register, charging status display, automatic time zone alignment
CASE
Case Diameter: 42.0 mm
Case Thickness: 12.0 mm
Case Length (Lug-to-Lug): 47.9 mm
Material: Titanium with Super-Hard Coating
Bezel: Two-Layer Titanium/Aluminum with Cutout Indexes
Crystal: Sapphire Crystal (Super-Clear Coating)
BAND
Material: Titanium with Super-Hard Coating (Chamfered Links)
Lug Width: Integrated
Clasp: Three-Fold Clasp with Push-Button Release and Smart Adjuster Function
MOVEMENT
Movement: Caliber 3X62 GPS Solar Powered
Accuracy: GPS satellite synchronization ($\pm$15 seconds per month without a satellite signal)
Power Reserve: Approximately 6 Months on a full charge (Perpetual operation through ambient light)Water Resistance: 100 Meters / 10 Bar
Luminous: High-grade LumiBrite on hands and indexes
Functions: GPS signal reception indicator, multi-functional indicator register, charging status display, automatic time zone alignment
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.
