Grand Seiko Caliber 9S65

Seiko in-house caliber 9S65A found in a Grand Seiko automatic watch. This caliber was released in 2010 and is essentially an upgrade from GS cal. 9S55 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. The Spron 610 hairspring is anti-magnetic. This Grand Seiko movement is rated to be accurate within -3/+5 seconds/day. Read more: Official 9S65 operating instructions from Seiko Be respectful and keep comments on the topic of Grand Seiko Caliber 9S65. 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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