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第二代Grand Seiko上市,它擁有日期功能與防水50 m
Cal.430(5722A)、手上鍊 35石、Low Beat 18,000 bph
Cal.430,5722A(Self-dater) -- Seiko internal Chronometer declaration. 18,000bph
5722B(Calendar) -- (1966-)GS standard official approval. No Chronometer declaration. 19,800bph
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