Before I continue, below are links showing hundreds of examples of forged Mickey Mantle baseballs, photos, etc. found on Ebay (the most dangerous place to buy autographs if you're a casual collector or impulse buyer).

https://live.autographmagazine.com/forum/topics/ebay-mantle-dimaggi...

https://live.autographmagazine.com/forum/topics/examples-of-mickey-...

https://live.autographmagazine.com/forum/topics/most-common-mantle-...

Below are links to blogs on "Examples Of 500 Homerun Club Forgeries."

https://live.autographmagazine.com/forum/topics/examples-of-500-hom...

https://live.autographmagazine.com/forum/topics/coa-guaranteed-fore...

Here's another example of a forged 500 Homerun Club baseball.

According to the seller these are all authentic except for the Ted Williams "which is suspected to be a clubhouse."

The Ted Williams is not a clubhouse, it's a common forgery.