In Part I we traced the genesis of Calibre 9SA5, and here we look at the evolution of Grand Seiko’s Spring Drive movements, culminating in this year’s new calibre. To understand their place in the Grand Seiko story, let’s look at the genesis of each in turn.
These are entirely new movements, with every element developed and produced in-house and designed to last for decades as the foundation for a whole new generation of watches. This year, to mark its 60th anniversary, Grand Seiko has introduced two new movements, representing each of the brand’s two pillars: Calibre 9RA5 is a Spring Drive movement while Calibre 9SA5 is a traditional mechanical movement.
If you haven’t yet read Part I, find the full article right here.
I/trending 23304 IN-DEPTH: Grand Seiko Movements – Part II, the Spring Drives Sandra Lane
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