Grand Seiko Mechanical 9S Series
Although proud of their quartz calibres, in the mid 1990s, Seiko decided that in order to fulfil the demands of the market, it needed to reinvent its mechanical movement watches. In 1998, Seiko produced its first entirely new mechanical movement the 9S. It was available in two versions, the 9S51 with no date, and 9S55 with date. The 9S calibre was fitted with a special mainspring that, at a time when watches provided a 40-hour power reserve, made possible for a 50-hour power reserve, and was only available in Japan. This 9S calibre brought in the possibility for a mechanical GMT, thus the Grand Seiko 9S56 was created, featuring a fourth hand indicating GMT. Exquisite Timepieces is an authorized dealer of the Grand Seiko Mechanical 9S collection. You can find Grand Seiko Mechanical 9S watches for sale here.