This Duncan steel yo-yo was manufactured by the Cayo Manufacturing Company in 1934. It has flat black sides with a black and white stripe design around the edges. There is a red, yellow and blue internal, metallic spinning disc that can be seen through small cut out windows in the sides. The decal reads “Genuine Duncan Rainbo Yo-Yo, Trade Mark Reg. USA.” The Duncan Toys Company contracted its metal yo-yos to the Cayo Manufacturing Company until World War II.
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