Id think that one with the stray N is a printing error.
You can see parts of the an from the line above, and a bit of "sb" from Pittsburgh as well.
It's probably what's called a "kiss print" where the paper is set onto the type, but slightly off, then moved into the correct position and printed.
In this case it looks like the paper was touched while on the type in the wrong spot so the area printed came out pretty solid. Usually it's more like a light hint of doubling.
Unless the backs are lithographed, then ignore all the above as it's a typography thing.
Steve B
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