Okay, two are from the '50s. But mostly from the '40s.
And when i say Fantastic, i really mean Fantastic Adventures, but that's not to say they didn't have fantastic covers -
Extra Bonus: When digging through those old issues, one can find original covers for old Edgar Rice Burroughs tales! (Admittedly, that might excite me more than some others)
covers from Fantastic Adventures (1940-1951)
(image names contain month/year of each issue)