I believe that is considered a rim Cud, my understanding is that a Rim Fin is a thin flange that extends vertically from the rim/edge junction of a coin struck within the collar. But I am no expert on this and will wait for one to chime in.
You might need to see on the edge if there is stoping points on the ends of that area. It maybe a struck through debris on the edge wrapping over the rim area. I just can say for sure from the images provided. But that is where I would look first on this one. The first clue would be: 'Not seeing the copper cladding on that area.' If it is cover, then I would think debris. If you see the copper layer, then the flattened fin issue. But a closer look on that area would be the first step.
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