The copyright marks on these prints confirm a 1930's date and that they were published in Paris.
In my attempts to find examples, I tried searching for postcards, often a reliable source of reproductions and dating material. Sadly no real luck; there is an American artist Charles Dana Gibson who specialised in glamorous fashionable Edwardian "Gibson Girls" but his signature was completely different and there was a French graphic postcard artist from the 1920's who signed "S Gibson" whose subjects were Mabel Lucy Attwell type cute children.
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