"Grey Sky" YAS406   Authentic Swatch!  Classic Irony automatic model.  Does not need a battery, the movement of your wrist makes it work.  Watch is pre-owned but in perfect in perfect working condition.  Will fit a wrist of 18 cm or smaller.   Details: Crystal: polished Case: polished, very good Band:   good, adjustable Diameter case: 38 mm  30 meters water- resistant Box: no