Sinn watch 144 st diapal 144068 leather sinn watches continue to impress with their sporty and sophisticated designs perfect for professional men in need of a reliable and striking timepiece found within the bead blasted 41mm stainless steel case of this sinn 144 st diapal watch is the valjoux 7750 gmt self winding movement that can be watched hard at work through the open case back the movement also boasts sinns famous diapal technology with lubrication free escapement the bold charcoal