Audemars Piguet might pip Patek Philippe to top five spot as sales hit CHF 1.6 billion - WATCHPRO USA
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The Royal Oak: A Watch Masterpiece at 50 - The New York Times
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Audemars Piguet Royal Oak ref. 15202 vs Patek Philippe Nautilus ref. 5 – Horus Straps
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History of the Patek Philippe Nautilus | Time and Watches | The watch blog
