Grand Seiko 200m Spring Drive diver’s watch reference materials. SBGA461 and SBGA463

Grand Seiko’s Spring Drive 200m diving watch has always been admired for its accuracy and robustness. Now, according to ISO Standard 6425:2018, the in-depth readability is further enhanced by including Lumibrite time scales in all 12-hour time scales, including the time scale at the three o’clock position on the right side of the calendar frame. […]

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