If You’re a Rolex enthusiast or even a budding collector, you’d undoubtedly need to know much more about your timepieces – and decoding the reference range is one of these. Even though not as much of the home name as Rolex, Maybe, Audemars Piguet offers another thing to would-be wearers: https://www.watchesworld.com/a-history-of-watch-reference-numbers/