What is covered by the Grand Seiko warranty? What is "Grand Seiko Standard"? What is "Grand Seiko Standard Inspection Certificate"? Can I get my Grand Seiko Standard Inspection Certificate reissued? How accurate is Grand Seiko? Guidelines for the accuracy of Grand Seiko while in use: What is the accuracy of the mechanical watch in use / the mechanical watch movement at rest? The accuracy of the mechanical watch in use The accuracy of the mechanical watch movement at rest Why doesn’t the accuracy of my Grand Seiko mechanical watch match the rate written on the Grand Seiko Standard Inspection Certificate? How to take care of my Grand Seiko watch? What is the polishing service?