Sinn Watch 556 I B Blue Cowhide Strap 556.0104 Blue Cowhide Strap.  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 polished 38.5mm stainless steel case of this Sinn 556 I B 2 watch is the ETA 2824-2 selfwinding movement which is proudly displayed through the open case back.  This impressive movement equips the timepiece with hours, minutes and seconds function, 25 bearing jewels and 28,800 semi oscillations per hour. The striking blue electroplated dial is unmissable beneath the scratch resistant sapphire crystal glass with antireflective treatment, and like many Sinn watches, the dial also boasts indices and hands coated in luminescent colour for optimal legibility even in the dark. Having become famed for their fully equipped timepieces, the brand has enhanced this Sinn 556 I B watch by ensuring it has a water resistance of 200 metres and is anti magnetic and shock resistant. To complete the look of this Sinn 556 watch, a luxurious blue cowhide leather strap and stainless steel buckle is added.