The scene depicted is rather anachronistic. Although Superman never personally got involved in fighting on the European front (except for the famous, non-canonical, short story where he ends the war in a matter of hours by bringing Hitler and Mussolini to justice), the bi-plane, the mounted cannon, and the barbed wire on the hill suggests a first world war setting.
[untitled] Promotional Material (from Publisher) on Interior Page(s)
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Inside front cover.
The Purple Plague Story on Interior Page(s)
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[untitled] Promotional Material (from Publisher) on Interior Page(s)
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Superman's Special Monthly Message to the Supermen of America! Promotional Material (from Publisher) on Interior Page(s)
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The Train Robbery Story on Interior Page(s)
6
The Boot Thieves Story on Interior Page(s)
4
The Ivory Safari, Part 1 Story on Interior Page(s)
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[untitled] Advertisement on Interior Page(s)
0.33
Several small ads in the right hand column of the first page of the text story.
Forest Fire Text Story on Interior Page(s)
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[untitled] Advertisement on Interior Page(s)
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Several small ads in the right hand column of the second page of the text story.
The Zombies [Part 1] Story on Interior Page(s)
10
[untitled] Promotional Material (from Publisher) on Interior Page(s)
1
[untitled] Story on Interior Page(s)
0.67
[untitled] Advertisement on Interior Page(s)
0.33
Murder in the Air Story on Interior Page(s)
6
[untitled] Story on Interior Page(s)
1
Values and Colors Change Text Article on Interior Page(s)
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Page includes several small ads from stamps dealers.