Duncan's first version of the bowling ball yo-yo called the "Bo-Yo" on the saddle card and not the yo-yo.
Oddly enough, this MOC version 1 has "Official AMF Bo-Yo Return Top" printed on a saddle card that also says "A Duncan Product" in the lower-left corner of the card. But, "Duncan" and "Bo-Yo" are not stamped anywhere on the yo-yo halves; just "AMF" in a circle within a triangle. Lettering, triangle, and horizontal row of three tiny holes are painted white. The three bowling ball finger holes are not painted. Yo-yo also included a separate sheet of yo-yo tricks and a sheet of bowling techniques and tips. This unusual Duncan version is quite hard to find. No four digit stock number was printed on the card.
Version 2 from 1965 has "AMF Duncan Bowling Ball Yo-Yo Return Top" printed on the saddle card, and the one halve is stamped with "Duncan" and "Bo-Yo" (not painted). It did not include a separate yo-yo trick/bowling tips sheet. A stock number of 2100 was printed on the card.
