I had nearly 20 of the '66 Clay cards from as strong of a first-hand source as possible - someone who worked at Panini in the 1960s. All of them were the dark version. (There were no Validas among the group.) I've noticed the difference as well in the light / dark version, and can't theorize why it is - but only can say that of the bunch which I had that came directly from the factory, they were all dark.
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