I need to ask for some opinions on this one. Could this be multiple die cracks on obverse, with another crack on reverse at lower right corner of memorial? I haven't been doing this very long and haven't found any pictures of multiple die cracks like this.My gut tells me it's just something with the clad layers but wanted to run it by knowledgeable people.
Your "gut" was quite right. As John1 said, these are Linear Plating Bubbles caused by some contaminant between the copper plating and zinc core. This could be moisture, air or an object like a hair that has caused the zinc to start breaking down releasing gasses and corroded powder.
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