Which famous author endorsed Parker Pens in the 1930s with the quote 'I've found that Parker Duofold is a real pal that never lets you down and never runs dry'?

Throughout literary history, famous authors have occasionally lent their names and reputations to commercial products - sometimes to supplement their income, other times due to genuine appreciation. These endorsements provide fascinating insights into both the authors' lives and the marketing strategies of their era. How well do you know these unexpected intersections of literature and commerce?

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Ernest Hemingway
Virginia Woolf
F. Scott Fitzgerald
Agatha Christie