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High-beat precision and three days of power reserve. Introducing the first Grand Seiko mechanical chronograph, the Tentagraph. | Grand Seiko
How accurate is the Seiko 5 Automatic watch movement? Mine loses about one minute per day, and I'm wondering if that is within specs. - Quora
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How Accurate Is Seiko Automatic Watch? I Own 4 Of Them And This Is My Answer | Automatic Watches For Men
How accurate is the Seiko 5 Automatic watch movement? Mine loses about one minute per day, and I'm wondering if that is within specs. - Quora
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