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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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