From 1978 here is one of the increasingly hard to find flicker (lenticular) superhero yo-yos. Duncan made Batman, Wonder Woman, Superman, Spiderman, and The Incredible Hulk Magic Motion Yo-Yos. Definitely a call to "Collect Them ALLLLLLl!"
Duncan actually made three different Hulk yo-yos. This is the only one that flickers. Move the yo-yo back and forth. You will see two different Hulk poses on one side. The reverse side is stationary.
This yo-yo is mint and never has been taken out of the box, which has made taking clear pictures difficult. If you would like more pictures, please ask.
It still has the original shipping tape attached .
Start your collection todayyyyy!