Sinn watch 556 i m black alligator 5560101 black alligator 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 glistening 385mm stainless steel case of this sinn 556 i m black alligator watch is the eta 2824 2 self winding movement that can be watched hard at work through the open case back the unique and unmissable chocolate brown dial with sunburst decoration shimmers ben