Sport Tokyo Lion GMT

44.5mm sounds large until you remember it's titanium, not steel — the weight-to-diameter ratio here is the whole argument for this reference, since a 44.5mm steel case would wear noticeably heavier on the wrist. Spring Drive's glide-motion hand, the power reserve indicator, and 200m of water resistance make this the most capable Spring Drive GMT case size in the range, and the champagne dial is a warmer choice than Grand Seiko's usual cool-toned sport dials. I catalogue titanium sport GMTs separately from steel ones precisely because the comfort math changes at this diameter — this is where titanium earns its premium.