One thing this shows is that it's really hard to determine which Fawcett characters may be in the public domain. There has been some argument here that we should not make character pages for early Fawcett characters (from the first few years) because they were almost certainly in the public domain years before DC bought Fawcett's comics division.
But this shows a comic as early as Whiz Comics #3A is still under copyright. So we should include all Fawcett characters* -- which is our policy anyway, but this reinforces the policy.
*except the ones we know Charlton bought, but that's a different issue
I believe the argument was that if DC didn't technically own the character and DC had not yet chosen to revive the character, then they are clutter. This was being made about characters like the Hunchback and the Devil's Dagger. Of course, then DC did revive (or at least reference) the Hunchback, so it goes to show you never know.
So there are umpteen dozen excellent old Fawcett stories that we can't access because DC does own them, and other old Fawcett stories that we shouldn't work on because DC doesn't own them, or might not own them. Bah.