That Old Comic May Be Worth $100!!!

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An ad from a DC comic, October 1975.

I suspect that these binders were similar to the binders that are still used to hold magazines today... the book is probably secured under a metal rod that is placed in the centerspread. It would keep the spine straight, but probably not do much to protect it from dust and oxidation.

Even 30 years ago there was a "value" mentality regarding collecting comic books.