The photos aren't sharp, which is a warning sign right there. I'd avoid this unless a strong authenticator saw it in person. The ball looks refinished. The autographs look printed. I wouldn't be surprised if it was an old ball with low-value names on it that were removed and printed versions of Ruth and Gehrig added.
I'm late to the party, but I agree with all observations made thus far and 1 more that I can add. I've seen these two signatures before. Verbatim. I don't even need to search for them, I remember them well. These two signatures have been "repatriated"/copied and transferred from two other sources.
The ball looks like it was chemically cleaned prior to their addition.