On sale date is Library of Congress copyright record publication date.
The final panel has a signature that appears to read 'AL KATRES'. No evidence is found of any artist of this name in the Who's Who, and it may be a pun (Alcatraz).
Previously credited to 'Jack Cole ?' this has none of his characteristic layouts or figures. Although the Who's Who gives no indication that Dick Sprang worked for anyone other than D.C. during this period, the artwork is a dead giveaway. Look at the face of the Mountie in the splash panel and the pair of Mounties on the final panel of page four for confirmation.