This steel Duncan yo-yo was made by the Cayo Manufacturing Company in the 1930s. It has flat sides and a red, yellow and blue starburst lithograph seal design on both halves. There are two small air holes that make a whistling sound when the toy is spun. The decal reads “Genuine Duncan Whistling Yo-Yo.” The Duncan Toys Company contracted its metal yo-yos to the Cayo Manufacturing Company until World War II.
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