




Seiko Prospex Alpinist SPB505J1 'Summit Black' Automatic Watch

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The SPB505J1 'Summit Black' carries the spirit of the original Alpinist, Seiko's first sports watch designed for the Japanese "Yama-otoko" (mountain men). This modern Prospex iteration offers exceptional specifications for any adventure
Powered by the in-house Seiko Caliber 6R35, this watch delivers a robust 70 hours of power reserve (over 3 days), ensuring reliability even if left off the wrist for a weekend. The automatic movement also supports manual winding and hacking
The SPB505J1 'Summit Black' carries the spirit of the original Alpinist, Seiko's first sports watch designed for the Japanese "Yama-otoko" (mountain men). This modern Prospex iteration offers exceptional specifications for any adventure
Powered by the in-house Seiko Caliber 6R35, this watch delivers a robust 70 hours of power reserve (over 3 days), ensuring reliability even if left off the wrist for a weekend. The automatic movement also supports manual winding and hacking
Gender: Men's
Movement: Automatic with Manual Winding (Caliber 6R35)
Power Reserve: Approx. 70 hours
Jewels: 24
Precision: +25 to -15 seconds per day
Dial Color: Black ('Summit Black')
Case Material: Stainless steel
Strap/Bracelet: Stainless steel bracelet (or Calfskin leather - often comes on a bracelet)
Crystal: Sapphire crystal with magnifier and Anti-reflective coating on inner surface
Water Resistance: 20 bar (200m)
Magnetic Resistance: 4,800 A/m
Case Diameter: 39.5mm
Case Thickness: 13.2mm
Lug-to-Lug: 46.4mm
Lug Width: 20.0mm
Features: Date display, Stop seconds hand function, Rotating compass inner ring, Screw-down crown, See-through & Screw case back.
Gender: Men's
Movement: Automatic with Manual Winding (Caliber 6R35)
Power Reserve: Approx. 70 hours
Jewels: 24
Precision: +25 to -15 seconds per day
Dial Color: Black ('Summit Black')
Case Material: Stainless steel
Strap/Bracelet: Stainless steel bracelet (or Calfskin leather - often comes on a bracelet)
Crystal: Sapphire crystal with magnifier and Anti-reflective coating on inner surface
Water Resistance: 20 bar (200m)
Magnetic Resistance: 4,800 A/m
Case Diameter: 39.5mm
Case Thickness: 13.2mm
Lug-to-Lug: 46.4mm
Lug Width: 20.0mm
Features: Date display, Stop seconds hand function, Rotating compass inner ring, Screw-down crown, See-through & Screw case back.
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.