The Standard Catalog of Baseball Cards says:
"This 11-player card set was available through a mail-in offer, One dollar and three proofs of purchase form Hillshire Farms were needed to obtain the set. The card fronts feature paintings of recent Hall of Fame inductees. A coupon was also included with each set." I'd add that the card stock they used is very thin.
Never seen these before, pretty cool! I recognize the photo on the Yaz from his '76 Topps card:
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I'll see your Yaz with Killebrew, 1972 Topps
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