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23 May 2020, 10:37 AM | #1 |
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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 |
23 May 2020, 11:09 AM | #2 |
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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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23 May 2020, 11:32 AM | #3 |
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Japanese manufacturers prefer to underpromise and overdeliver.
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23 May 2020, 01:51 PM | #4 |
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23 May 2020, 02:24 PM | #5 |
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24 May 2020, 02:13 AM | #6 |
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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.. |
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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