ACTION COMICS. published monthly by Detective Comics, Inc., 480 Lexington Ave., New York, N. Y. Second class entry pending at Post Office, New York, N. Y. under the Act of March 3, 1879. Subscription rates: 12 issues by mail in the United States, its possessions and Mexico, South America and Spain, $1.50; elsewhere $2.60. The Publisher accepts no responsibility for unsolicited material. Entire contents copyright 1938 by Detective Comics, Inc.
The on-sale date is the publication date reported in the U. S. Copyright Office filing.
In the documentation for the testimony from Detective Comics, Inc. vs. Bruns (Fox) Publications April 6 and 7, 1939, the on sale date for this issue is described by Jack Liebowitz as being April 18, 1938.
This is confirmed again in the documentation for the Siegel lawsuit against Warner Bros (CASE NO. CV-04-8400-SGL (RZx)) published on March 26, 2008; the on sale date for this issue is listed as being April 18, 1938.