Seiko exponentially improves the accuracy of its Spring Drive movement, now measured in seconds per year, rather than month.

Watch collectors have strong feelings about quartz versus mechanical watches: Battery-powered quartz is inexpensive, accurate and robust, but it lacks the je ne sais quoi of an electricity-free ...

The Grand Seiko Spring Drive is a mechanical movement exclusive to the Japanese watch company. It mimics the accuracy and operation of a quartz movement without a secondary power source. It was a ...