Key Specifications
- Automatic Seiko 4R34 movement
- GMT (second time zone) function
- ~41-hour power reserve
- 42.5 mm case diameter
- 100 m water resistance
- Hardlex crystal
- Display caseback
- Jubilee-style bracelet on most SKX GMT variants
What people like about it
- Excellent value for an automatic GMT.
- Reliable and easy-to-service movement.
- SKX-inspired design that many Seiko enthusiasts enjoy.
- Comfortable case dimensions despite the 42.5 mm size.
- Available in several colorways such as SSK001 (black/gray), SSK003 (blue/black “Blueberry”), and newer variants.
Limitations
- It’s a “caller GMT” rather than a “traveler GMT,” meaning the GMT hand is adjusted independently instead of the local hour hand.
- Hardlex crystal rather than sapphire.
- 100 m water resistance and no screw-down crown, so it’s less dive-oriented than the original SKX.








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