Mark, isn't that a die break or chip on the last column? Also, on one of my recent post, the rim of another cent looked very similar to this one and I called it a Rim Fin. Mike Diamond commented and said it was a Cud. Sent it to JC and he assigned it a number.
Well, long or short answer? Because of the length of the "uprising" for lack of better description, that is a finning. Caused but the metal being forced upwards during strike. The Cud you are in reference to is a Rim Cud. This is different from a full Cud in the location. The rim Cud forms on the rim offset portion of the die, a chip right on the edge of the die itself. The Cud is actually a breaking off of the design area of the die. I'll post a pix in a few minutes to show the areas concerned. RED shows the portion on a die where the rim offset will form the rim when pressed against the retaining collar. it is this edge here that breaks off. Cuds are formed when edge sections break off of the die face. At times a whole section of the dies including the offset areas are effected.
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