I had something similar on a reverse of a nickel several years ago. Several people suggested it was solder. Then I come across an identical match (same date and mintmark). When I showed the pair, somebody said it was a "bleb" (die erosion pit).
I see 3 marks at regular intervals (the 3rd one is weaker), the non the rim, I see another one that appears incuse and it is in a straight line with the first 3.
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