2018 MARKET UPDATE: DROPPED OUT OF THE 100 HOT COMICS LIST
Now the fuss about Supergirl is well and truly over, this relatively scarce Silver Age tryout issue has lost favor with investors.
There is downward price pressure on all grades. The fuss about SuperGirl being in a TV series flushed out a bunch of copies -- there are now 180 in the census.
Supergirl is hot property right now, thanks to the DC Comics policy (finally!) of announcing a series of major movie releases over the next few years.
Teen Titans and Justice League of America both have a chance of featuring a Supergirl character, so it's odds-on that early appearances like this tryout issue are going to be great investments.
This is a surprisingly rare book, with only 77 in the CGC census. Don't be TOO picky, but try to find one with a nicely presenting front cover and the majority of faults on the back.
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DROPPED OUT THIS YEAR:
Superman Comic Book Price Guide
Value of Vintage and Key Issue Supergirl Comics
True Origin and First Appearance of Supergirl in Action Comics #252