Copyright information was found in the Library of Congress online archive for this issue. The copyright date is listed as December 28th 1943. The cover date is listed as February 1944.
Bails indicates "Everett Raymond" is a pseudonym for Everett Raymond Kintsler, so it is possible "E. Raymond" refers to him.
First appearance of the Grim Reaper. He appears next in WONDER COMICS #1. Origin told in WONDER COMICS #2.