Grand Seiko SBGH311 Mt. Iwate Hi-Beat Limited Edition
Vol.6 The creation of 9S85, the next generation of high-beat calibres.: The all-new high-beat calibre 9S85 | The 9F and 9S calibres in nine chapters | Grand Seiko
grand seiko SBGH245 9S85-00W0 Mechanical high beat TO90380 | eBay
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Vol.6 The creation of 9S85, the next generation of high-beat calibers.: A new team with new solutions | The 9F and 9S calibers in nine chapters | Grand Seiko