The on-sale date is from the publication date recorded in the Catalog of Copyright Entries, Part 2, Periodicals, 1945, New Series, Vol. 40, No. 4.
Dick Mace text story.
Mike Kooiman and Jim Amash state in the Quality Companion that Gustavson created the strip and wrote it. Gustavson's son, Terry Gustafson, concurs.
Letters credit from Terry Gustafson, Paul Gustavson's son.
Credits from Martin O'Hearn at http://martinohearn.blogspot.com/ ; art formerly attributed to Al Bryant.