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Between 1960 and the first half of the 1970s, numerous models were produced, which can be divided into seven different families, based on the movements. There are seven families, and not eight as we often hear, because the caliber 3180 (renamed 5720) and the 430 (renamed 5722) are actually part, according to Seiko’s official documentation, of the same family of movements.
https://www.theseikoguy.com/grand-seiko ... cconmWpipo
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