This is a no-brainer Sandy Koufax forgery.
The card stock does not look correct.
The same sellers who have been listing and selling those forged Jeter counterfeit cards, have also been selling these like hotcakes.
This is listed on Ebay now.
https://www.ebay.com/itm/Sandy-Koufa...7ea7%7Ciid%3A1
KoufaxCounterfeitJoanne-2.jpg