The Flash is hot property at the moment, thanks largely to the DC Comics TV series. Barry Allen's first appearance also is the book which is credited with beginning the Silver Age of comics.
Along with these good reasons to invest in this tough book are the Showcase series itself. A very tricky run to put together if you're particular about condition.
Other entries on the Hot 100:
You're going to struggle to afford a nice copy of Showcase #4. We drew the line at CGC 3.0, which is still thousands of dollars.
Aim for one with the nicest eye appeal possible.
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