Description

The present reference 3971ER is a quintessential second-series example of Patek Philippe’s legendary grand complication lineage, manufactured in 1989. Serving as the essential bridge connecting the iconic vintage reference 2499 to the contemporary 5970, the 3970 enjoyed a celebrated production run spanning from 1986 to 2004, commanding profound reverence and extensive scholarly documentation across the collecting world.

With few hundred examples ever produced, this second series remains exceptionally rare—and within this exclusive cohort, pink gold iterations with an original sapphire crystal back are exceedingly elusive, with fewer than 10 pieces known to the market. While the first series produced from 1986 until 1988 was still offered with a snap-on back, the second series—produced from 1987 until 1990 as seen on the present watch—marked a critical technical evolution. The extract designates the reference as 3971ER, E for étanche, French for waterproof, reflecting the transition to a robust screw-down caseback construction.

All of this mechanical pedigree is packed into classic proportions: a warm 36mm 18k pink gold case featuring the model’s signature multi-tiered stepped lugs and a concave bezel that slides effortlessly under a cuff. The screw-down sapphire crystal display back provides an unobstructed view into the mechanical mastery ticking inside.

The silvered dial delivers timeless, understated balance. Defining characteristics of this second-series execution include polished applied baton markers paired with graceful, leaf-shaped hands. Despite displaying the hours, minutes, small seconds, perpetual calendar, chronograph, moon phases, 24-hour day/night indication, and leap year cycle, the layout remains remarkably harmonious, airy, and legible—a masterclass in grand complication dial architecture.

Turning the watch over reveals the revered Calibre 27-70 Q, an exquisitely finished 24-jewel hand-wound mechanical movement based on the legendary Lemania 2310 architecture. Operating via a traditional column wheel and lateral clutch, the calibre demonstrates haute horlogerie finishing at its absolute pinnacle, complete with sweeping Côtes de Genève, black-polished steel components, perlage, and mirror-finished anglage across the bridges and levers.

This rare 1989 collector’s piece is presented on a classic brown alligator strap, secured by an 18k pink gold buckle.

Patek Philippe – Bio

Patek Philippe & Co. was founded in 1839, located in Geneva and the Vallée de Joux. It designs and manufactures timepieces and movements, including some of the most complicated mechanical watches. It is considered by many experts and aficionados to be one of the most prestigious watch manufacturers.
In 1868, Patek Philippe made their first wristwatch, which was sold on November 13, 1876 to the Hungarian Countess.
It is the last independent, family-owned Genevan watch manufacture with uninterrupted operating history spanning nearly 180 years.