I don't think this set has been highlighted before. In 1960, in conjunction with Sports Novelties, Leaf Inc. produced a nice set of 144 cards. Since Topps had the rights to selling baseball cards with gum, Leaf inserted a marble with their cards. The cards were B&W and featured two series of 72 cards each. The first series is much easier to find than the second series. It looks like the cards in the first series used many of the same photos that were used for the Jays photo packs from that era. There are also several variations in the set, but none of them involve the Orioles.
1960 Leaf Box
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The Orioles set included Brooks Robinson and Hoyt Wilhelm in the first series, so Brooks isn't too hard to find. Six of the eleven Orioles from the set were in the second series, making putting the team set together a little bit of a challenge.
1960 Leaf #1.jpg 1960 Leaf #2.JPG