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The new caliber 9RA5 incorporates replica IWC Schaffhausen a number of enhancements to the self-winding Spring Drive movements. It replika IWC seems to be an objective for Grand Seiko to have the potential to produce thinner watches, and while the SLGA001 is a thick watch, the caliber 9RA5 incorporates some changes in construction to allow for a flatter profile.