The on-sale date is from the publication date recorded in the Catalog of Copyright Entries, Part 2, Periodicals, 1943, New Series, Vol. 38, No. 2.
This character is virtually identical to Wessler's "Filbert Fox," who appeared in Wonder Comics #4 (February 1945).
Bill Hudson was credited with writing and drawing the Stinky stories in Real Funnies #1 and Real Funnies #2. Art is similar in style to those two stories.