Which famous 20th century author appeared in print advertisements for Waterman fountain pens with the tagline "The pen that helped me write The Old Man and the Sea"?

Throughout literary history, authors have occasionally lent their names and reputations to product endorsements, creating fascinating intersections between literature and commerce. Some of these partnerships became legendary, while others remain obscure footnotes in publishing history. Test your knowledge about these unique collaborations between literary giants and commercial products that shaped cultural perceptions and marketing strategies.

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Ernest Hemingway
F. Scott Fitzgerald
John Steinbeck
William Faulkner