Well, I finally pulled the trigger and bought a Joe DiMaggio signed baseball. It's actually one of the signed photoballs from Yankee Clipper Enterprises - the Estate of Joe DiMaggio. I know these are not necessarily always authentic since unsigned ones are available for sale wherein a forger could do his work on a blank ball. However, there have recently been three or four of these signed photoballs on eBay that have also been PSA'd, although mine has not been. It just comes with the letter from Yankee Clipper Enterprises, Inc.
So I felt confident enough to make the purchase. Please let me know what you think. Do you think it's authentic or not? Thanks in advance.