On-sale date from copyright registration.
Used as the splash panel for the Superman story, but with the image reversed.
Credits from Siegel's records: Siegel and Shuster v. National Comics Publications, Inc. et al., case no. 1099 (Westchester Cty. Sup. Ct. 1947). Alvin Schwartz used the name Vernon Woodrum for his comics work.
The splash panel is identical to the cover, but with the image reversed.