Each of my watches is thoroughly checked by a retired master watchmaker. Battery is exchanged for a new one. For watches with a mechanical (manual or automatic) movement, the movement is checked, cleaned and readjusted. I check every watch again before shipping to see if there are any defects. Therefore, it is impossible in my opinion that the crown of the watch was defective. I immediately offered a repair and offered to pay for the return. But the buyer wanted the watch to be taken back. Had inquired that no jeweler takes back a watch that has defects, even if the watch costs 2000 and more. He will have it repaired or send it back to the manufacturer to repair the damage. PLEASE also read my other reviews.