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

This Patek Philippe Annual Calendar reference 5150G-001 is a limited edition made to mark the 150th anniversary of Patek Philippe’s partnership with Tiffany & Co., produced in 2001 in just 150 examples. Its self-winding calibre 315 S QA LU, Patek’s first annual calendar movement, modified for this reference to add a moon phase, combines an annual calendar with moonphase, a configuration that gave the reference its place as a commemorative variation on one of Patek’s most practical complications. For a collector drawn to retailer-signed Patek Philippe watches, that specific occasion is what sets this watch apart within the line. In 18k white gold, the case measures 36mm across and 12.8mm thick, a compact size that keeps the watch close to the proportions of its period.The silver dial carries the calendar display with the balance and legibility that made the model such a success, marked by an oversized Tiffany ‘T’ at twelve and the Tiffany & Co. signature beneath the moon phase. More broadly, the 5150G-001 stands at the point where Patek Philippe's annual calendar had already become a house signature, yet still lent itself to rare retailer commissions of unusual specificity.