Sinn watch 556 i mother of pearl w black alligator 5560102 black alligator sinn watches continue to impress with their immaculate and elegant designs perfect for both men and women this sinn 556 i mother of pearl watch boasts an eta 2824 2 self winding movement enclosed within a stainless steel case that can be watched hard at work through the open case back housed beneath the scratch resistant sapphire crystal glass with antireflective treatment is a mesmerising white mother of pearl di