Stamps on comic books - Akiko

I recently got an issue of Mark Crilley's Akiko -#34 -where he hand-drew two Japanese stamps on the cover (images are courtesy of the Grand Comics Database). He did the same for #32-33. I guess I'll add this comic to my stamp collection - if only so I can find it again someday.

1960s Superman stamps?

Has anyone seen the three Superman stamps that were available by 1968?

Don't remember them? That's because they appeared in Action Comics 359 in "The Case of the People Against Superman!" by Leo Dorfman and Curt Swan.

Thanks to Ofer Berenstein for spotting this and sending it along.