I was looking at some dimes and noticed that the obverse of this one was very shiny, I flipped it over and noticed that the torch is missing details. From the other coins in the bunch not being minted later than 1977, this can't be wear because there's too much of it. Coin is of normal thickness.
Is this a weak strike or
Struck Through Grease? It says "one d me" which is from grease but is it also the cause of the weakness in the centre?

