Looks like a clubhouse signature. The ball appears to have other autographs on it. Quite often the Ruth on the sweetspot was signed by a batboy or clubhouse man if Ruth was unavailable.
This is most definitely not an authentic Ruth autograph.
Please post pictures of the other panels. Certainly looks like a Harridge team signed ball to me. I see Waite Hoyt on the south panel and at least one other signature on the north panel.