Can someone explain this movie franchise to me? I don't get it

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The tagline on '1921' says 'A Decade After 1920'. I wonder why the movie wouldn't then be 1930.

 

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[Zirnwyb]

 

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[My cravat doesn't flutter]

There's even a board game tie-in!

 

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@My cravat doesn't flutter
Missed: 1933

Spoiler: Missing film 1933

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