This is the cover to Horwitz Publications' Strange Tales #4:
The cover is illustrated by Australian artist Maurice Bramley. It appears to be loosely based on the following two images from The Impossible Man in Fantastic Four #11:
This issue reprints both main features in Fantastic Four #11 - A Visit With The Fantastic Four and The Impossible Man - and the pin-up page:
In essence, Strange Tales #4 is a local edition of Fantastic Four #11.
This issue was published c.July 1963. Horwitz reprinted this issue c.September 1965 - again as Strange Tales #4 - under a new Bramley cover:
This cover image is a montage based on two panels in the Avengers origin story The Coming of The Avengers!, which Horwitz had published c.January 1965 in The Avengers #1:
However, the contents of the two editions of Strange Tales #4 are not quite identical. Each issue contains a single-page illustrated feature by Bramley. Strange Tales #4 (1963) includes Stranger Still:
and Strange Tales #4 (1965) includes Goblins:
Strange Tales #4 (1965) was intended to be Strange Tales #7, but Horwitz got their wires crossed in recycling Strange Tales #4 (1963) and the issue number stuck.
It is not only the last issue in the series, but appears to be the final Marvel super hero issue by Horwitz, which included a single Daredevil issue and the aforementioned Avengers #1. Indeed it appears other Marvel properties published by Horwitz such as Sgt. Fury and Battle Action also terminated around this time.