I also like adding coins like that to collection.
I can see/agree that it might be a late die strike.
But have you weighed the coin to see if it might
be a light planchet. If it is light enough you
might see the flow lines, like this coin show,
but maybe not enough coin to fill the die.
Lastly I have heard of set up coins, when the mint
is setting up the dies the first coins out may not
get a good strike.
When I was collecting a lot of nickels, I think I read for
nickels there is a bigger tolerance for coin weight. Something like + or - .2 grams.
The dies are set more for the slightly heavier planchets.
The heavier planchets would get the full strike and the
lighter coins would be mushy. The correct weight coins
look ok ... but not full strike.
Of course this is just my opinion, based on what I have read.