The Grand Seiko 55th Anniversary Spring Drive Chronograph Limited Edition by Seiko

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May 2016

This Limited Edition, fitted with a ceramic bezel, houses the unique Spring Drive movement, specially tuned for enhanced accuracy. The crystal oscillators are selected individually with time and care, achieving an accuracy of +/- 0.5 seconds a day (+/- 10 seconds per month).

Source: Europa Star March/April 2016 Magazine Issue