Hamilton H42545551 Jazzmaster Viewmatic Skeleton Gent AutoProduct Overview The Jazzmaster Viewmatic Skeleton Gent showcases the movement of the hairspring, escapement, and mainspring of the H 20 S movement, creating a dynamic representation of time as it ticks away. This piece expresses all of Hamilton's craftsmanship through its skeleton dial. Specifications Product Number H42545551 Caliber H 10 S Collection Jazzmaster Movement Automatic Case Size 40mm Thickness (mm) 11 Dial Color Silver Case Material