Grand Seiko Heritage; SBGN013Grand Seikos 9F86 Quartz doesnt mess around when it comes to accurate timekeeping. Model: SBGN013 Grand Seiko Heritage, 9F86 0AF0 Year: February 2020 Features: The Movement. The 9F86 is accurate to + 10 seconds per year, thanks to its thermo compensation. It checks the ambient temperature around the watch 540 times per day to ensure the movement can adjust and regulate itself. The Seal. Upon opening the case back you might notice the movement itself
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