Patek Philippe Perpetual Calendar 3940J

Patek Philippe Perpetual Calendar 3940J 18K Yellow Gold Silver Dial FIRST SERIES

The First Series is distinguished by its sunken sub‑dials at 3 and 9 o’clock, a design trait exclusive to the earliest production run, and the accented “GENÈVE” signature on the dial—both hallmarks of its collectible provenance. The Patek Philippe 3940J First Series in yellow gold, introduced in 1985, represents a seminal moment in modern horology as the brand’s first serially produced perpetual calendar with a micro-rotor automatic movement. Crafted with the ultra-thin Caliber 240Q, this model measures a refined 36 mm in diameter and approximately 8.8 mm in thickness, embodying the elegance and technical prowess Patek Philippe is celebrated for. Excellent Condition with Patek Philippe box and papers dated 1987.