That is strange that they are a different size. Even if it is not an error good job keeping a sharp eye out Ruben!
what design purpose can they serve? One vertical and one horizontal dent is what it looks like to me.
Ruben, not sure one way or the other but I was looking at a 61 franklin half and where you circled is the pivot points are on the wooden stock attached to the bell. Maybe its not an error just a weak strike. I'll have to dig out my Ike's and compare.