[spec]

Eric,
As you have surmised, this set comes in two distinct sizes with the actual measurements differing slightly depending on how they are cut from the back of the package (outside the dotted lines, on the dotted lines or inside the dotted lines). I have nearly complete boxes on the smaller version and they are the 10-ounce size of Post 40% bran flakes. Presumably, the larger size, which over many years of collecting this set has seemed less common, comes from a 12, 14 or 16-ounce box. By the way, the Canadian cards are slightly narrower and slightly taller than the US small-size cards.