Seiko 5 Sports SKX Sports Style GMT – Black Dial, 42.5mm, Automatic GMT – SSK001

The Seiko SSK001 belongs to the Seiko 5 Sports SKX Sports Style GMT series, the first Seiko 5 Sports line to carry a true GMT complication. It keeps the rugged SKX diver silhouette and adds a 24-hour hand so you can follow a second time zone without doing the math.

This reference features a black dial with a metalized bi-color GMT bezel. Inside is the Seiko caliber 4R34 automatic with hand-winding, hacking seconds, a 24-hour GMT hand and about 41 hours of power reserve. You also get a 42.5mm case, Hardlex crystal, 100m water resistance and stainless steel bracelet.

The SSK001 is available to pre-order; pre-ordering reserves a watch from the next shipment (expected end of October 2026). You can also visit Chicago Clock Company in Clarendon Hills (431 E Ogden Ave), Orland Park (14486 LaGrange Rd) and Palatine (1615 N Rand Rd), family-owned since 1917.

Seiko SSK001 Overview

The Seiko SSK001 is a distinguished member of the Seiko 5 Sports GMT collection that brings practical functionality and robust design together in a versatile mechanical timepiece. Positioned as one of the first Seiko 5 Sports models to include a GMT (second time zone) complication, the SSK001 is ideal for travelers, daily wearers, and enthusiasts who appreciate the heritage of Seiko’s sport watches. With durable construction, thoughtful design elements, and a reliable automatic movement, the Seiko SSK001 offers strong value within its segment.

Key Specifications (Quick View)

• Movement: Seiko 4R34 automatic GMT with manual winding and hacking
• Power Reserve: Approximately 41 hours
• Case: Stainless steel, 42.5mm diameter
• Thickness: 13.6mm
• Lug-to-Lug: 46.0mm
• Lug Width: 22mm
• Crystal: Hardlex with magnifier
• Water Resistance: 10 bar (100 meters)
• Weight: 161.0g

Seiko SSK001 Specifications

Design Heritage & Aesthetic

The design of the Seiko SSK001 draws inspiration from Seiko’s iconic SKX series, a line deeply revered in dive and sport watch communities. This influence is reflected in the case proportions, dial layout, and overall utilitarian styling. The black dial is framed by a metalized bi-color GMT bezel with a 24-hour scale that clearly differentiates day and night hours. Bold LumiBrite-coated hands and hour markers ensure excellent legibility, while the prominent GMT hand allows for quick second time zone reference. A magnified date window at 3 o’clock enhances daily usability.

Case Construction & Dimensions

The stainless steel case delivers a strong wrist presence without sacrificing comfort. Measuring 42.5mm in diameter and 13.6mm thick, with a 46mm lug-to-lug length, the watch wears securely and confidently. Brushed surfaces paired with polished accents elevate the sporty design, while the Hardlex crystal and screw-down exhibition case back reinforce durability and mechanical appeal.

Movement & Performance

Powering the SSK001 is Seiko’s in-house 4R34 automatic movement. This 24-jewel caliber offers approximately 41 hours of power reserve, hacking seconds for precise time setting, and both automatic and manual winding capability. The integrated GMT function makes it an excellent companion for travelers or anyone tracking multiple time zones.

Bracelet & Comfort

The five-row stainless steel bracelet combines brushed outer links with polished inner links for a balanced, refined look. A three-fold clasp with push-button release and secure lock ensures stability on the wrist during everyday wear and activity.

Water Resistance & Durability

With 100 meters of water resistance, the Seiko SSK001 is well suited for daily wear, including exposure to rain, hand washing, and recreational swimming. While not intended as a professional dive watch, its construction reflects Seiko’s reputation for dependable sport timepieces.

Wearability & Versatility

The Seiko SSK001 offers a versatile aesthetic that transitions easily from casual environments to business-casual settings. Its GMT functionality adds real-world utility, while the black dial and bi-color bezel ensure broad styling compatibility. The design honors Seiko’s sport watch heritage while maintaining a modern, approachable profile.

Care & Maintenance Tips

To ensure long-term performance, avoid prolonged exposure to strong magnetic fields and extreme temperatures. Rinse the watch with fresh water after exposure to moisture, and clean the case and bracelet periodically with a soft cloth. Regular servicing by a qualified watchmaker will help maintain accuracy and reliability over time.

The Seiko SSK001 is a compelling mechanical GMT watch that blends classic Seiko design language with modern functionality. Its reliable movement, thoughtful construction, and everyday versatility make it an excellent choice for both new collectors and seasoned enthusiasts.

FAQ

What movement is in the Seiko SSK001?

The SSK001 runs on the Seiko caliber 4R34 automatic with hand-winding, hacking seconds, a 24-hour GMT hand and about 41 hours of power reserve.

Is the Seiko SSK001 water resistant?

Yes. It is rated to 100 meters (10 bar), which covers swimming and snorkeling. It is not a scuba diving watch.

How do you use the GMT hand on the Seiko SSK001?

Pull the crown to the first position and turn it to move the 24-hour GMT hand to your home (or destination) time. Read it against the 24-hour bezel while the main hands show local time. The bezel can also rotate to track a third zone.

Where can I buy the Seiko SSK001 near Chicago?

Chicago Clock Company carries it online and in our showrooms in Clarendon Hills (431 E Ogden Ave), Orland Park (14486 LaGrange Rd) and Palatine (1615 N Rand Rd).