the first nickel is a 1995 Philadelphia and exhibits almost no ware! It must be a defect in the blank. If you blow it up everything is also double stamped.
The second one is a 1999 Philadelphia and I have no idea about that one.
I think both are damaged coins. The first one is damaged on one side and the second one is damaged on both sides, possibly from a fire or some other heat source. The black areas on the second one looks like carbon from a torch.
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