The on-sale date is from the publication date recorded in the Catalog of Copyright Entries, Part 2, Periodicals, 1941, New Series, Vol. 36, No. 1.
Spacehawk; illoes not by Wolverton
Creator credits confirmed by Shaun Clancy and the Comics History Exchange list on Facebook from the personal records of Larry Antonette which included pages of stories he worked on torn from the original comic books (21 February 2015).