The on-sale date is from the publication date recorded in the Catalog of Copyright Entries, Part 2, Periodicals, 1940, New Series, Vol. 35, No. 4.
Some data from I.N.D.U.C.K.S website https://inducks.org/index.php
Third page is continued on page sixty-two.
Short text story that gives clues for Crossword puzzle on same page