I wanted to repost this one as I don't feel like the original post ever really reached any sort of consensus as to good or bad.
These items came from the collection/estate of Fred Bengis who was a batboy for the Yankees between 1959 and 1962. This would explain having the name Fred written multiple times. Fred would turn 18 in October of 1959.
The 3rd image is of the inside pages right after the cover. The last image is of the back page. The Bob Grim and Mel Allen signatures absolutely do not appear to be authentic and the Mantle inside the cover looks to be an attempt at copying the printed signature. It also varies significantly from the signature on the cover. My guess is that those were done by Fred himself. Also looks like another Mantle copy was done on the back, but that has since been erased. It's only just barely visible.
MantleBookletA.jpg
MantleBookletB.jpg
MantleBookletC.jpg
MantleBookletD.jpg