The 1966 Marvel Super Hero set contains 66 cards, each measuring 2 1/2" by 3 1/2". Produced by Donruss, the cards are referred to by the caption that appears inside the a white word balloon on each card.
The 1966 Marvel Super Hero set contains 14 cards are blank inside their speech bubbles, along with the invitation to "Write Your Own" caption. Many kids accepted this challenge, and for this reason, the "Write Your Own Caption" cards are much harder to find in pristine grades.
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