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While both watches are GMTs they perfectly illustrate the diverging paths that Grand Seiko takes its GMT offering. The Hi-Beat watch ref. SBGJ277 is link made in stainless steel with a case measuring 44.2mm by 14.8mm thick housing a 9S86 movement running at 36000 vph. Conversely link the high-intensity titanium 44.5mm by 14.9mm case of the Spring Drive GMT link ref. SBGE307 houses the highly accurate 9R66 Spring Drive movement that runs ±1 second per day ±15 seconds per month on average.
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