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Nestled safely inside that lightweight but beautifully finished titanium case, we find Grand Seiko's 9RA5 Spring Drive caliber, which was first link used (for a non-limited dive watch) in the SLGA015. With five days of power reserve and a monthly accuracy link rating of +/- 10 seconds, the 9RA5 represents the cutting edge of the Spring Drive movement for sports patek philippe calatrava watches and was recently made thinner and stronger by Grand Seiko.
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