A diminutive Duncan Championship Tricks yo-yo booklet featuring Duncan's Mr. Yo-Yo. From about the late 1950s to early 1960s. These booklets were made available by Post cereals. It may have been free inside cereal boxes or it may have been a mail-away promotional item that also came with a wooden Duncan "Rainbow Tournament" model (nearly identical to the Duncan "Super Tournament" model but stamped with "Rainbow" instead of "Super") that had a fade of half red/white halves. I have yet to locate a picture of the cereal box associated with this booklet and the yo-yo. The booklet itself described many original yo-yo tricks that have been the core of yo-yo play for more than 80 years.
