Which famous author served as an official brand ambassador for a major fountain pen company, claiming the product was essential to their creative process?

Throughout literary history, some famous authors have lent their names and reputations to product endorsements, creating fascinating intersections between art and commerce. These literary brand ambassadors often had complex relationships with the products they promoted. Test your knowledge of these unique partnerships between literature's greatest minds and the commercial marketplace. Can you identify which author-brand pairing actually happened?

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Ernest Hemingway for Parker Pens in the 1940s, who claimed 'The right pen makes the words flow like good whiskey'
Virginia Woolf for Waterman's Ideal Fountain Pen, which she endorsed as 'the only instrument worthy of a woman's thoughts'
Mark Twain for Conklin Crescent Filler Pen, which he certified as 'a profanity saver' that never leaked in his pocket
F. Scott Fitzgerald for Mont Blanc, which he called 'the champagne of writing instruments' in magazine advertisements