This is a very normal D. The mint mark punch used was extremely worn. The trick is to find a 1979 D five cent piece that has a D with a clear mint mark that has a nice opening in it. It's probably next to impossible.
The D on this particular coin is also slightly damaged. being very normal also means it is not odd. If you look at several hundred of them over time, you will see that the D's on 1979 dated nickels all look pretty much like this.
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