From what little of the Gehrig can be seen at that steep angle, a head on picture of the Gehrig signature is needed to be sure, although from what I can see of it looks like it's in the range of proper Gehrigs.
In this thread? I only see a full on Gehrig in the other thread about the Gehrig ball. Is that the one you mean, because I don't see any images here showing Gehrig other than the "worm's eye" view.