Here are a couple of certified Killebrews with similar styles. In addition, I have seen many, manny Killebrew's that look like these that originated from legitimate collections that came up for sale.
https://www.ebay.com/itm/Harmon-Kill...Cclp%3A2334524
https://www.ebay.com/itm/HARMON-KILL...EAAOSwStheMemQ