This card, too, piqued my interest. Like the OP, I think the signature on the card is similar to the auto of the New York Mets Rick Anderson.
Several years ago, I purchased a few thousand baseball autographs from the estate of a collector/dealer I had known for several years who actively collected into the early 1980's. I found these two Rick Anderson signed index cards in that collection. The first he identified as the Rick Anderson who pitched for the Mariners:
This one he identified as the Mets' pitcher:
Obviously, both are quite different. So, did PSA err?