Here's DEREK: When the Marx Big Wheel hit the market, I was too heavy to enjoy one. My best friend, Patrick Patterson, had one and his mother made it abundantly clear that I was never to ride it by pointing out that the decal attached to the toy's stem spelled out "RECOMMENDED ONLY FOR CHILDREN WEIGHING LESS THAN 65 LBS."
I guess from this ad, then, one can assume that Cap'n Horatio Magellan Crunch's avoirdupois is less than 65 pounds.
Note the short-lived "Cinnamon Crunch" and "Vanilly Crunch" in addition to the still-extant "Peanut Butter" and "Crunch Berries" varieties.
MY guess is that "Vanilly Crunch" probably didn't have any vanilla in it and, hence, Quaker got around it with the "Vanilly" nomenclature.