My great grandma had this 1919 S wheat penny and this one has a possible clogged die error on the reverse in the words UNITED STATES. Thoughts??
It might have started life as a little weaker strike than normal, with 100 years of wear and tear, it is what it is - a very well circulated coin that's taken a few knocks.
By "die clog" did you mean grease filled die ? Welcome to C.T. keep looking and you'll find something sometimes.