GRAND SEIKO SPORT COLLECTION SBGN005 9F Quartz GMT Men's Blue Watch GS198YA. My goal is to make your experience with me as stressfree as possible. We guarantee all the display items are authentic, and there are no pirated or illegally copied items. Model number SBGN005 Product name 9F Quartz GMT Material Stainless steel Dial blue Movement quartz Size Case: Diameter 39.0mm (excluding crown) Arm circumference: 20.5cm Total weight: 150g 9F caliber boasting the highest precision in the world, known as "Quartz beyond Quartz". This is the first caliber 9F86 with a GMT function for the first ...