Which renowned 20th century novelist appeared in television commercials for Waterman pens in the 1980s, famously stating that he used them for writing his celebrated works?

Throughout history, authors and literary figures have occasionally lent their names and credibility to product endorsements, creating some fascinating intersections between literature and commerce. These endorsements sometimes reflected genuine appreciation, while others were purely financial arrangements. This trivia explores a notable instance of a famous author's unexpected product promotion that surprised the literary world.

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Gabriel García Márquez
Gore Vidal
Norman Mailer
John Updike