Thor debuted in Journey Into Mystery 83, cover-dated August 1962.  This was, of course, the very early days of modern Marvel.  The Fantastic Four had only 5 issues under their belts, and the Incredible Hulk had just 2.  JIM was a monthly title (FF and Hulk were bi-monthlies), so Thor was actually the first super-hero headliner to appear every month, beating out Ant-Man by a month.  Spider-Man als…