My original tumblr post was here. It comes to us via Little Bunny Sunshine. A bit research shows it to be a crop from the June 1942 cover of Famous Fantastic Mysteries (ISFDB entry here, done by Virgil Finlay:
I found the full cover at Pulpcovers.com.
Burn Witch Burn looks good, but now I really want to learn the mystery of the horror-dirigible!
Burn, Witch, Burn! was the source material for the movie The Devil Doll (1936), directed by Tod Browning.