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Jeff ShepherdJust pulled this ad out from my collection - published May 8th, 1951. I don't know all that much about this series, but found it interesting that the cards were packaged with a candy bar of some sort. They appear to be Redbacks, with a 51 Topps Connie Mack Christy Mathewson hiding behind Phil Rizzuto. Were Connie Macks issued alongside Redbacks? Also, note the rounded corners on the Mathewson - are they ever found that way? Enjoy...
edited to add publishing date.