[perezfan]

Originally Posted by Domer05

According to this listing, these were issued in the mid-1950s as part of a "pennant kit" by Post Cereal as part of a promotion they were running....

https://www.ebay.com/itm/1955-Post-C...cAAOSwsQJeu~iH

Had to be issued between 1955 and '57 (based on the inclusion of both Kansas City Athletics and NY Giants/Brooklyn Dodgers). I would lean towards Bazooka but cannot find anything definitive to support it.