Duncan YoYo Strings Set of 5 Genuine Original Yo-Yo Toy American
Smithsonian - Duncan Genuine Yo-Yo, 1930s America owes its fascination with the yo-yo mainly to Chicago businessman Donald F. Duncan Sr., who spotted it while on a business trip to San Francisco
Duncan 1955 Super Tournament Wooden Yo Yo
Duncan Vintage Wooden Tournament Day Glo 77 Yoyos in original display box - Yoyoplay