The cover indicates this is issue #72, August 1970 (which should be correct). The indicia indicates this is issue #73, October 1970. There is another #73 already indexed and dated October 1970. The stories indexed for #73 are all different than this issue. Since the stories here are unique, and the cover matches one of the interior stories, and since the cover date seems correct for a bimonthly schedule, this is probably just a mistake in the indicia.
Cover art is taken from the splash page of this story.