the seller did not post an image of the back of the card that features the authentication statement, but i did not want to waste time by asking for clarification lest someone else purchase the card out from under me. i knew it was an authentic signature, and i had a pretty good reason to suspect that it was certified, so i snapped it up.
sure enough, the card was delivered, complete with richard p. mcwilliam's best wishes.
i based my assumption that it was certified on the fact that i had previously had harmon sign the base version of this card as one of my in-person autograph experiences with him
and he avoided signing the "year platter" as a few other players have done with these cards when signing through the mail. my assumption was that harmon did that to differentiate the cards signed in person from the certified versions, but of course i really don't know for sure. what i do know is that i am happy to have another killebrew auto in my collection (my second certified), especially from this set! i've updated my timeless teams autograph collection as well.