It's a US 'war' nickel from the Philadelphia mint. The '4' in the date, as well as the rest of the coin, is damaged.
The 4 in the Date is there under a loop.The low areas have a lot of luster.Acid wash? The gray points are the only wear. If the strike was weak I would agree with You.
Could be a very late staged capped die if it weren't showing in the same manner on both sides. I'm going with environmental damage on this one.