Sinn watch 356 sa pilot iii aligator leather black 356 sa pilot iii aligator leather black at a classic 385mm in diameter the case boasts a fine satinised finish and exudes outstanding sophisticated functionality particularly noteworthy is not only the guilloche silver electroplated dial but also the highly curved sapphire crystal glass which is ground out and carefully polished using a complex process involving an approximately 5mm solid blank with five different curvature radii this n