As long as it isn't a reprint or reproduction, those autographs are authentic.
Awesome, thank you for the info
The sad thing is, it's actually a surprise to open one of these "Is my Mantle / DiMaggio / Williams real" threads to see the autographs are authentic.
Guilty until proven innocent! Lol.
All three signatures are the real deal. It appears, up close, that there are spots on the M and a in Mantle that have come off a bit, hopefully it isn't from the plexiglass over it.