Being the first 100% sports watch by De Bethune, the GS Grand Blue features a new calibre. Entirely developed and manufactured by De Bethune, it is a hand-wound movement with central seconds and a five day power reserve, which is indicated on the dial. Water resistant to 100 meters, this watch offers excellent readability even in the darkest depths due to ingenious lighting inside the movement and a new photoluminescent blue. The rotating bezel is used to calculate immersion time, and generally Modern Automatic Diamond Watch For Business, Timeless Blue Watch With Skeleton Dial, Timeless Blue Skeleton Dial Watch, Modern Blue Watch With Skeleton Dial, Modern Skeleton Dial Watches For Business, Modern Watches With Tachymeter And Round Dial, Modern Chronograph Watch With Chronometer, Business Diamond Watch With Skeleton Dial, Modern Watches With Chronometer And Round Dial