Patek Philippe 5150G T150 Annual Calendar "Tiffany & Co." 18K White Gold Silver Dial

Introduced in 2001 to celebrate the 150th anniversary of the Patek Philippe and Tiffany & Co. partnership, the Ref. 5150G “T150” is a restrained yet profoundly significant annual calendar wristwatch. Crafted in 18K white gold, the 36 mm officer‑style case opens via a hinged back to reveal the meticulously finished automatic Caliber 315/189, stamped with the Geneva Seal and enhanced with a moon‑phase display—an elegant evolution of Patek’s first annual calendar movement ([phillips.com](https://www.phillips.com/detail/patek-philippe/191583?utm_source=openai)). The dial presents a rare silver tone, with day, date, and numeric month apertures arranged in a refined layout, while an oversized “T” at 12 o’clock and the Tiffany & Co. signature beneath the moon‑phase subtly underscore the collaboration ([everywatch.com](https://everywatch.com/patek-philippe/annual-calendar/5150/watch-12047315?utm_source=openai)). With only 150 pieces produced in white gold as part of a tri‑metal limited edition, this piece is exceptionally rare and steeped in both horological and cultural significance ([everywatch.com](https://everywatch.com/patek-philippe/annual-calendar/5150/watch-12047315?utm_source=openai)). Collectors prize its combination of technical innovation, historical commemoration, and aesthetic restraint. The movement’s 48‑hour power reserve, central seconds, and exquisite finishing further elevate its appeal ([everywatch.com](https://everywatch.com/patek-philippe/annual-calendar/5150/watch-9081964?utm_source=openai)). This is not merely a watch, but a wearable chapter in the storied legacy between two icons of luxury. Like New with Patek Philippe Tiffany & Co. box, setting pin and papers dated 2001.