Yancy's Yo-Yo Trick Book by Humphrey Corporation, 1975.
More of a sheet than a book. Four panels. Humphrey yo-yos were of one plain design and almost always had some sort of advertising printed on them. Notice that the sheet does not even brand the yo-yo that "Yancy" uses. An interesting generic period piece with a now-dated character. These booklets occasionally appear with branding across the top, above "Yancy's", such as the name of a pizza restaurant.
