The watch technology of Grand Seiko Spring Drive 9R movement (Part 7)
Grand Seiko SBGD205 Heritage Collection Spring Drive 8 Days, Image source: piazo.jp
In order to get to know the technology of Grand Seiko Spring Drive 9R watch technology better, let us first remind you of the course of history that gave birth to it. The Spring Drive concept originates from 1977, from the mind of Seiko engineer Yoshikazu Akahane. It took him 22 years and more than 600 prototypes, to finally introduce the Spring Drive in 1999. Seiko Spring Drive movements are also used in other Seiko brands aside from Grand Seiko, including Prospex and Credor series. However, movements released under the Grand Seiko roof are reserved for this brand only. These movements are called Spring Drive 9R family.
Circuit board for the Tri-synchro regulator, Image source: thenakedwatchmaker.com
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