Now that is a pretty penny.
Unless the baseball came from Alex personal collection, I would not bid so high on it. Anything pre-MLB authentication, it is difficult to invest heavily.
Personally, I have about a dozen or so of those special marked baseball from his 600th HR chase. They were all signed by Alex and authenticated.
It was even cooler when he recognized the "special marked" baseball and ask "did you spend a lot on these?" and my reply "Not as much since it was not signed yet."

I wished I could have convinced MLB authenticator there to update the infos with the existing MLB hologram - but he was too busy to write them down.
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