Hi I was hoping to get some thoughts on some Yankees and Dodgers autographs from I believe the mid 1950s. These are part of a larger collection of letters written to my friend's grandfather who was a NY sportscaster, so I'm certain they're not fake. However I am leaning towards some of them being secretarial, especially the bigger names. Would love some opinions on the photos below, specifically with Mantle, Stengel, Elston Howard, Jackie Robinson, Reese, Campanella, Hodges, etc. Many do not match up to other examples I've seen, hence my hunch they aren't truly authentic, but would love some further thoughts.