A buddy of mine uses a sharpie marker to add a strike to his call. It is sort of a way of personalizing it.
My nephew was messing with my pot calls as I was trying to teach him how to run one, when he noticed the notches in the bottom of the older call. When I told him that each notch was for a turkey that was taken with the help of that call, He thought it was pretty cool. He said, "Kinda like those fighter plane pilots used to paint under the windows of their airplanes." I told him that in a different sort of way, it was similar.
Luck Counts, good or bad