There is absoutely no indication of a repunched mintmark there. Denver coins are very well known for 'filled' mintmarks throughout the late 1970s and that's all this is. The mintmark punches were nothing more than little blobs then. About half the time there was no center to the mintmark. Nice way of giving false hope people.
One of the hardest coins to find would be a 1979 D cent that didn't have a blob for a mintmark:-) It's pretty much the same for all denominations in the late 70s.
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