Per Craig Delich, this cover is a paste up of figures by Mooney and Paris.
The Joker's head is from the cover of Batman (DC, 1940 series) #44, as spotted by Antiqueira.
Penciler credit verified by Sprang. Inker credit verified by Craig Delich; we previously suggested Gene McDonald or Jim Mooney.
Art credits by Craig Delich; we previously credited John Daly.