Excellent detective work by JEFF. Indeed a "slam dunk" The first thing that caught my eye was Walter Beall on the ball he only pitched in one game in 1927 on May 30th and is the toughest autograph from the team. I've only seen one in my life and it was on his 1927 Yankees paycheck. Some of those made to order team balls (and single-signed) are so well done that it's almost impossible to detect them from scans alone.
Although I've never seen one in person I'm guessing that under magnification there would be "stress marks" from pen to leather and a black light might reveal some "tells" too. Again all a guess. But indeed another reason to be careful.
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