Sinn watch 144 st sa 144066 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 sa watch is the valjoux 7750 self winding movement that can be watched hard at work through the open case back the model also boasts sinns famous ar dehumidifying technology which enhances functional reliability and freedom from fo