Which famous author's endorsement of a writing instrument in the 1960s led to a 400% sales increase for the product and revolutionized the premium pen market?

Throughout literary history, author endorsements and product partnerships have shaped both book sales and cultural trends. From Ernest Hemingway's famous liquor preferences to modern authors' branded collaborations, the relationship between literature and product marketing has evolved dramatically. This trivia question explores a particularly influential literary product endorsement that transformed both an author's career and an entire market segment.

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Ernest Hemingway with the Parker 51 fountain pen
Virginia Woolf with the Conway Stewart fountain pen
Georges Simenon with the Montblanc Meisterstück fountain pen
F. Scott Fitzgerald with the Waterman fountain pen