I found this 1978 D LMC that appears to have the Blakesley effect without a clip present. If had a few clipped coins and sent off a few to a friend. The edge is not pinched as the last photo will show and the C in AMERICA shows the distortion associated with the Blakesley effect when above a device. I don't believe this is PSD. It's an anomaly for sure.
Looks like a very small edge clip. Not damage as the 'IC' on America would have also been altered by a contact mark. There was not enough metal on that area, thus the weak rim on that area. But just enough, to not leave a Blakesley affect. Just a baby clip. Just small enough to affect the rim, without weakening the devices.
I agree with Coop that this is most likely a tiny clip. These are often referred to as "rim clips" or "disc clips". As the coin expands and pushes into the collar, the concave profile of the clip is erased, but there is insufficient metal to fill the dies' rim gutters. Hence the weakness.
Because you use the term Blakesley Effect I will give the explanation for better understand what COOP explain. Explanation of Blakesley Effect: The flattened area that occurs opposite the 'clip' on incomplete planchet coins. On very large clips many times it is not show.
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