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SBGW231 The watch has a 3day power reserve and combines the latest in hairspring technology with an escapement developed through the MEMS technology to achieve high accuracy and stability when worn The delicacy, strength and beauty of the movement can be enjoyed the exhibition case backThe SBG31G is the 'Grand Seiko' update of the 'Seiko' SBGA031 This means that after Seiko and Grand Seiko were separated two years ago, all models received a new dial that only indicates 'Grand Seiko' instead of the double naming ('Seiko' and 'Grand Seiko') they had beforeNothing about the watch is referenced beyond the brand name, and there isn't even a date window to disturb the serene beauty of the dial Grand Seiko Sbgw231 Watch Review 19 Timepieces Blog Sbgw231 thickness