Hi everyone! I just got into the coin collecting world last week. I just ordered my first silver proof set, straight from the mint, and when I opened it I noticed a small brown stain(?) on the bottom of the obverse. I'm wondering if this is common, a nuissance or an error work keeping, or I should contact their customer service and request a replacement. Thanks for any help! If anyone needs more pictures let me know but I felt that was sufficient. It is definitely on the coin and not the case if the picture clouds that possibility a little.
