On-sale date from copyright registration.
Pencil and inks credits from Craig Delich and Pat Lang. Bob Klein and Gene Reed contend that it is Sheldon Moldoff pencils and Charles Paris inks. Letters credit from Todd Klein via his Klein Letters blog (18 September 2016, http://kleinletters.com/Blog/ira-schnapp-in-worlds-finest-comics-part-1/).
Art credits from Craig Delich and Pat Lang.