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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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Old 23 May 2020, 11:09 AM   #2
Lol-x
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My guess is so that people aren't going into Seiko service centres with their warranty card claiming for an adjustment and costing Seiko money for watchmakers performing warranty adjustments.
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Old 23 May 2020, 11:32 AM   #3
pickettt
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Japanese manufacturers prefer to underpromise and overdeliver.
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Old 23 May 2020, 01:51 PM   #4
toxicavenger
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Quote:
Originally Posted by pickettt View Post
Japanese manufacturers prefer to underpromise and overdeliver.
I wouldn't say that is always the case. Especially with the 6r15 and 8l35.
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Old 23 May 2020, 02:24 PM   #5
pickettt
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I wouldn't say that is always the case. Especially with the 6r15 and 8l35.
I don't own either. What's the story on them? I just know I've got sub $300 Seikos that are not more than +/- 6s
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Old 24 May 2020, 02:13 AM   #6
toptier
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Anecdotal: my 4-y/o SARB017 (6R15) runs at an average of 2-3 seconds/day when worn or dial up.
In comparison, my 1-y/o SLA019 (8L35) runs for about 8-9 secs/day.
I'm totally okay with that as a casual office user, but possibly from a professional diver PoV, one would definitely want COSC standards for their diver watch at the very least.
It''s crazy that Seiko regulates only their GS movements..
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Old 25 May 2020, 05:21 AM   #7
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If I had to hazard a guess, I would say they know from testing that these movements fall within this spec after their mfg process is complete. They probably have a procedure for setting timing that involve hitting some target metric without having to full-on spend time regulating. Using a method like this may likely allow the vast majority of movements to keep acceptable timing without investing valuable time into regulating a watch.

Thanks my uneducated guess.
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