Limited edition of 1000 pieces sinn watch 556 anniversary limited edition silicone 5560103 silicone to celebrate their 55th anniversary sinn watches have released this limited edition sinn 556 anniversary silicone watch that is limited to only 1 000 pieces enclosed within the stainless steel case is the eta 2824 2 self winding movement that can be watched hard at work through the open case back the striking anthracite electroplated dial with sunburst decoration gleams through the scratch