This Koufax look good
 

Not a typical fake that I see, but I do not know the autograph well enough to say yes or no, but leading yes.

I would vote no on this Koufax.

Koufax is way off.....look at graded examples of his real autograph and compare. Blatantly obvious.

No good

The "S" is weird and he usually spells his name with a "d" :)

I also wondered where the "d" was.