Grand Seikoさんのインスタグラム写真 - (Grand SeikoInstagram)「Grand Seiko 60th Anniversary Limited Edition Professional Diver's 600M. Grand Seiko introduces a new generation Spring Drive caliber that is slimmer, even more precise and has a greater power reserve. Caliber 9RA5 takes Spring Drive technology to a new level of excellence and opens a new era in the history of Grand Seiko. Caliber 9RA5's thin profile is made possible by the re-design and re-positioning of the Magic Lever. Developed in-house in 1959, the Magic Lever boosts the efficiency of the automatic winding mechanism by using the energy created by movement of the oscillating weight in both directions. In the new caliber, the new Offset Magic Lever is positioned away from the center of the movement to reduce its thickness. Remarkably, this is achieved with no loss of winding efficiency. The stem and crown are also positioned towards the back of the case to lower the center of gravity and achieve a comfortable fit on the wrist. Ref. SLGA001 [Caliber 9RA5] Limited edition of 700 https://www.grand-seiko.com/global-en/special/60th/springdrive5days/ #グランドセイコー #grandseiko #gs #slga001 #springdrive #5days #9ra5 #watch #腕時計 #craftsmanship #madeinjapan #sportcollection #thenatureoftime #watchfan #limitededition」3月6日 17時01分