I didn’t noticed any defect. I am returning it because simply I don’t like it and I did a little research and found out that this watch doesn’t worth the price I paid. 
Anyways I think I have right to return the item if I want to. And don’t tell me it’s worn I just tried it on my hand one time and I received this watch with damaged box which was replaced afterwards. The reason why I didn’t request return when I requested new box because that time I wanted to give it as a gift to my friend but later decided to return.