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Seiko Astron Watch GPS Solar Chronograph. The new Seiko Astron watches caliber shares all the core characteristics of the hugely successful caliber 7X52. Using just the power of light, it connects to the GPS network and tells time with atomic clock precision, adjusting at the touch of a button to every time zone on earth. In addition, the new caliber offers four new features that have been developed in response to ideas suggested by retail partners and customers worldwide. The new caliber does not replace the current one. It is an addition, designed to attract new consumers to the fast-growing world of Astron.
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