Grand Seiko Caliber 9S66

The Seiko caliber 9S66 is an in-house movement found in a Grand Seiko GMT Limited Edition. This caliber is essentially an upgrade from GS cal. 9S56 which offered a lower 48 hr power reserve. The 9S66 found in the limited edition GMT has a blue titanium/tungsten rotor featuring a Grand Seiko lion crest. Additional Resources: Read more: Official 9S66 operating instructions from Seiko Grand Seiko GMT Anniversary Limited Edition Review Be respectful and keep comments on the topic of Grand Seiko Caliber 9S66. Off-topic/general watch questions belong in the forum. Pro Tip: If you are on social media, use your social media handle as your name. If you create a Caliber Corner account, you can upload a profile pic and link to your sites in your profile.

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