I was not born yet when Post offered up these cards, but I always loved cutting cards off the back of packages or finding them inside bread wrappers or in cereal boxes. The 1961 series represents Post's first major release. Don't you just love the "care" taken on the trimming job?
You can find a complete checklist of all 200 cards: http://keymancollectibles.com/baseballcards/post/1961postbaseballcardchecklist.htm