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Those 'early days' would likely be the 1940's (also the period-setting for the upcoming Marvel Studios/Paramount feature "Captain America: The First Avenger").
Snyder's Vancouver-lensed "Watchmen" featured 1940's era scenes of super-hero vigilantes the 'Minutemen'.
The "Watchmen" back story, filmed in black and white, gave a realistic and nostalgic feel to the 1940's origins of the entire comic book superhero canon.




The 'early days' of Superman, from original creators Jerome Siegel and Joe Shuster, pictured Superman's personality as rough and aggressive, attacking and terrorizing wife beaters, profiteers, a lynch mob and gangsters, with a 'Batman'-type, loose moral code.

Also considered an inspiration for Snyder's upcoming feature is the 1940's Max Fleischer- produced "Superman" cartoons, showcasing a square-jawed 'Superman', his capable alter ego, 'Clark Kent' and a feisty, leggy 'Lois Lane'.
All 17 original animated shorts, featuring the first on-screen appearance of the 'Man of Steel', were re-mastered and fully restored in 2009.

Click the images to enlarge and Sneak Peek the 1940's "Superman"...

The strength of the Fleischer cartoons also followed through into the 1950's for "The Adventures of Superman" TV series, with actor George Reeves, bringing dignity to the character of supposedly 'mild-mannered' Clark Kent, as opposed to the sweaty, bumbling reporter that appeared in the more recent "Superman Returns".