New Railmaster came slightly defective

Hello!

Recently, I purchased a new Railmaster on Chrono24 from Japan. While I absolutely love the watch, I noticed a defect: one side of the lug is completely straight, while the other has a slight curve ground into it. Am I overreacting, or is this a valid reason to return it? Is this sort of thing normal? If I should return it, how should I proceed, especially since I only have a few days left to do this? Thanks for the advice!