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Spring Drive GMT calibre 9R86 and glide motion authenticate the SBGJ201
| Area | What to check | What is correct | Red flag |
|---|---|---|---|
| movement | Spring Drive calibre 9R86 | Seconds hand glides with zero tick; "Spring Drive" text on dial; calibre 9R86 visible through caseback; Grand Seiko signed rotor; tri-synchro regulator visible | Any stepping motion in seconds; "Automatic" text where "Spring Drive" should be; standard lever escapement visible in caseback |
| dial | Black dial with GMT designation | "Spring Drive" and "GMT" both present; "Grand Seiko" signed; GMT hand with correct tip coloring; date window at 3; luminous plot indices in correct placement | Missing "GMT" or "Spring Drive"; incorrect luminous plot size; date window at wrong position |
| case | 44GS-inspired case with crown guards | 44GS heritage proportions; crown at 3 with guards; alternating brushed and polished surfaces; correct 39.9mm diameter | Rounded crown guards; incorrect case proportions; uniform case polishing without brushed sections |
The SBGJ201 is a Heritage GMT powered by Cal. 9S86, a hi-beat mechanical movement at 36,000 bph (10Hz), not Spring Drive. The seconds hand steps at 10 beats per second: noticeably smoother than standard 4Hz but not the true continuous sweep of Spring Drive. The independently settable GMT hand is the primary authentication check.