Good way to let the reader know the story is set in 1911:
- Have a character mention the theft of the Mona Lisa from the Louvre
- Have a character think about their plans for the next few years, and by golly are they glad wars don't happen any more
(Honorable mention to stories set in 1912 where a character has a premonition or dream about a boat sinking, yet the story has nothing to do with the Titanic and it's never mentioned again.)
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