Hi all! I have these 63's here. As I was looking them over, I noticed that there seems to be a bump in the "U" at the bottom left. Out of the 8 stamps in the pic, there are 2 stamps that appear to have this bump (middle stamp in top row and far left stamp in middle row). Am I just seeing things or is this some kind of a variety? If you know where I could possibly check for info on this, it would be appreciated. I thank you in advance.