When images of this watch first surfaced, the world took immediate notice and for good reason. It was heralded as something of a unicorn: a one-of-a-kind Rolex, transformed into a perpetual calendar by none other than Franck Muller, one of the earliest pioneers of independent watchmaking. For years, a story circulated within the watch community. It spoke of a young Franck Muller, then a standout student at the prestigious L’École d’Horlogerie de Genève, receiving a Rolex as his graduation project. Allegedly, he single-handedly added a perpetual calendar mechanism to the watch using just 50 additional components — all ingeniously integrated within the original dimensions of the case. The tale didn’t stop there. It was said that even Rolex themselves were so intrigued by the technical feat that they arranged a meeting with Muller to learn more about the mechanism. Though they ultimately chose not to pursue the complication, the fact that they were willing to meet with a young watchmaker spoke volumes — a moment of recognition that foreshadowed Muller’s rise to become a legend in modern horology. But here’s the twist: the watch in question? It’s not the one seen on Jay-Z’s wrist. So what’s the real story? Which piece truly is the unique Rolex Perpetual Calendar modified by Franck Muller? Allow us to separate fact from myth.