Those 'mini post style cards' are from Bazooka gum boxes.
The cards look great and are worth quite a bit. I'd get all of the Mantle, Mays and Koufax cards graded by PSA first, because a grading fee is rarely wasted on them. Also invest in a big pile of Card Saver 1 and put the cards in them carefully to preserve them as best as you can. A crease or bumped corner can cost you hundreds of dollars.
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