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На просторах инета нашелся официальный ответ от Сейко на данный вопрос.
The 9R65 movement is used only for Grand Seiko. The only difference between 9R and 5R is the finish of the rotor bridge and shape of the rotor. As an example, striped pattern bridge for 9R and circular pattern for 5R. Processing method and time are same so it is difficult for us to judge which is better between them. However, in terms of technical modifications and improvements 9R and 5R is same.
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