Looks to me as if they tried to polish around the screws for the sideplate/The auction house description rated the finish “97% original blue”. It looks fine until you put it under bright light. This photo exaggerates what I first saw last night:
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I don’t know how to describe the shape on the side plate. However, it looks as if the odd shape is more polished than out toward the edges. The same odd shape shows up on the other side too. I even went to the auction preview and didn’t see this. It’s only visible under bright light.