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Patek Philippe Perpetual Calendar Chronograph Moonphase – Ref. 3970ER — Third Series – 18k Rose Gold – 2nd Caseback – Box & Extract – 1997

We are pleased to present this exceptional Patek Philippe Perpetual Calendar Chronograph Ref. 3970ER, one of the most beautiful and collectible complicated chronographs ever produced by the manufacture. Crafted in 18k rose gold and combining a perpetual calendar with moonphase and chronograph complications, this legendary reference represents the pinnacle of traditional Swiss haute horlogerie and stands among the most iconic Patek Philippe creations of the modern era.

Manufactured in 1997, this remarkable example is accompanied by its original box, setting pin, extract from the archives, and additional solid 18k rose gold caseback.

The elegant 36 mm case is manufactured entirely in solid 18k rose gold and showcases the timeless proportions that have made the Ref. 3970 such an enduring classic. Featuring beautifully stepped lugs, slim chronograph pushers, and a perfectly balanced profile, the case embodies understated sophistication and vintage charm while maintaining a refined and elegant wrist presence. The watch is further accompanied by both its sapphire crystal display back and original solid rose gold caseback, allowing the owner to alternate between showcasing the movement and preserving the watch’s traditional aesthetic.

The silver opaline dial is exquisitely balanced and highly legible, displaying the perpetual calendar indications with remarkable harmony. The day and month are presented through apertures beneath 12 o’clock, while the leap year cycle, moonphase, and date indication are elegantly integrated into the lower subdial. Applied rose gold hour markers and feuille hands complement the warm tones of the case, enhancing the watch’s timeless and sophisticated character.

At the heart of the watch beats the legendary Patek Philippe Caliber CH 27-70 Q, a manually wound movement celebrated for its technical excellence, reliability, and extraordinary hand-finishing. Based on the renowned Lemania ébauche and extensively reworked to Patek Philippe standards, the movement features a traditional column-wheel chronograph combined with a perpetual calendar mechanism capable of automatically accounting for varying month lengths and leap years. Admired by collectors worldwide, the CH 27-70 Q remains one of the most respected traditional chronograph calibers ever used by Patek Philippe.

The watch is fitted with a high-quality black alligator leather strap and secured by an elegant Patek Philippe 18k rose gold folding clasp, ensuring exceptional comfort and refinement on the wrist.

This Patek Philippe Perpetual Calendar Chronograph Ref. 3970ER is offered with:

- Original Patek Philippe presentation box - slightly consumed, like normal

- orignal warranty papers, Switzerland 1997

- manual booklet & leather document holder 

- Extract from the Archives - sold 1997

- Original setting pin

- Additional solid 18k rose gold caseback (“2nd back”)

- Excellent overall condition

- Coming from a fine private collection

"Widely regarded as one of the defining perpetual calendar chronographs of the late 20th century, the Ref. 3970ER - third series - perfectly captures the timeless elegance, mechanical sophistication, and enduring prestige that define Patek Philippe at its very highest level."