Concerning Hemingway and Calder. In the past year I have read three Hemingway related books. One is the novel of he and Hadley in Paris, another is the bio written by Valery Hemingway, Gregory's widow. She was Ernest's final literary secretary and was with him for, as I recall, his final three years. She married Gigi, Hem's strange, troubled son who became an MD and then turned himself into a female. The other is a newly edited "A Moveable Feast". Mary edited the one most of us read years ago. This new one IMHO is much better.
In one of those books a story is related about Hemingway knowing Calder during the Paris days with Hadley. As the story goes he purchased a painting from Calder and he kept it for the rest of his life. It might be in the Finca Vegia (probably misspelled).
In short, Ernest did know Calder when both were young men in Paris.
This is as close as I have been able to come to owning a Mannlicher Schoenauer like Hem's. He did buy one of these for Mary, I believe. Pauline's were 1903 models. This is a 1952 carbine in 30-06. A good woods gun for elk.