Yes, I read it. Thanks for sending the link, I really appreciate it.
MCS calls it the "first official Phantom comic book", which I'm assuming is the same thing as Overstreet designating it as Phantom #1 . Overstreet also states that The Phantoms first comic book appearance is in Ace Comics #11. I know that Overstreet almost always mentions the "first cover appearance" of almost all major (and many minor) characters. I don't see it mentioned in either one of these series (Ace Comics or Feature Books), and I can't seem to find the "first comic book cover" reference of the Phantom anywhere else, either in Overstreet or through googling. I'm pretty sure I found the correct pictures of the Ace Comics series. All I see are Katzenjammer Kids, no Phantom.
I'm selling this book, and it would be nice to know if Overstreet has overlooked giving it The Phantom's "first cover appearance". Other members on these forums have been kind enough to notify me of other other Overstreet discrepancies. If it is his first cover, I'm gonna go ahead and take the chance of slabbing it and selling it at auction, restored or not. If it's not his first appearance, I'll probably sell it on the CGC for sale forum.
Either way, I'm not gonna put it up for sale till I find out when Phantom first appeared on a comic book cover. I'm on a mission from God!