Which specially designed pen did Ernest Hemingway famously use to write many of his later works, claiming it improved his distinctive writing style?

Beyond the pages of beloved books lies a fascinating world of product design that has influenced literature for centuries. From the quills of Shakespeare's era to the specialized pens used by modern authors, writing instruments have shaped the way stories come to life. This trivia question explores a famous pen design that revolutionized the writing experience for one of the 20th century's most prolific authors, showing how product design intersects with literary creation.

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The Mont Blanc Meisterstück 149
The Parker 51 Aerometric
The Waterman Patrician
The Sheaffer PFM (Pen For Men)