Source: https://www.flickr.com.Uploaded to Flickr by Stephen Coles and tagged with "davida". License: CC BY-NC-SA.

An early paper sticker.

Big Zapper yo-yos, made byDavida, but Hobo/Roberta-ish fonts that I can't identify.

Pretty cool lettering(?) on this 1974 package, too.

Photo by Stephen Coles. Collection of the National Yo-Yo Museum. License: CC BY-NC-SA.