Duncan Whistling Yo-Yo Prototype

This developmental prototype for a whistling yo-yo was made by the Duncan Toys Company. It is made of stained wood with slotted pink and white plastic center pieces (diaphragms) attached to each half. There are eight small air holes on each side that produce a whistling sound when spun. Duncan’s previous whistling yo-yos were metal and manufactured by the Cayo Manufacturing Company. This example is likely an attempt by Duncan to self-produce a wooden whistler.

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