Some info verified using a DCM scan (http://digitalcomicmuseum.com/)
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.
Artist ID confirmed by Michael Vance in ALTER EGO #61.
Originally credited from this source to Gloria Charney.
But Gloria Kamen got married to Mr. Charney in 1947 (only after she had left comic field).
She also signed with her maiden name most of her following (juveniile) art career.
Jerry Bails Who's Who: http://www.bailsprojects.com/bio.aspx?Name=KAMEN%2c+GLORIA
A shop is named "KAMEN" (page 5, panel 5)