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Reload this Page Curious why Seiko's spec sheets for their movements
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Old 23 May 2020, 10:37 AM   #1
larryccf
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Curious why Seiko's spec sheets for their movements
state such large ranges for time accuracy - like the 6R15, iirc sez "-15/+20" and so many folks report COSC time keeping

my SUMO over 10 days is showing a total of 20 secs fast, which boils down to +2 seconds daily

anyone know
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