I'm somewhat new to errors so not sure, but it looks to me like theres die chips on the top of the shield. I found another one with the same chips in the same spots.
They are very common on the shield design. Die cracks are also seen on this area. They are so common that even as a marker that would be hard to make a match. Note the chips on the shield images.
For the record, what Coop means by the term "Marker" is a die chip, crack, etc., that helps to identify a die or die stage usually used in association with a more important variety such as a doubled die or Repunched Mintmark (RPM).
But when they become too common like on the tops of the Shield and the 12 Column on the Memorial, they are of little use. (most dies when they get older, have the same even happening to them.
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