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Lot Essay
The present stainless steel wristwatch is an exceptionally rare and historically fascinating École d'Horlogerie or 'watchmaking school' watch, signed by the student watchmaker Jean Pierre Curchod. Combining the rarity of a genuine Patek Philippe reference with the educational history of Geneva's watchmaking tradition, it represents a remarkable testament to the training of the city's future master watchmakers.
What distinguishes the present timepiece from other École d'Horlogerie creations is the fact that, although the case itself is unsigned, the inside caseback confirms it was originally manufactured as Patek Philippe reference 2509. Produced by the celebrated casemaker François Borgel, whose waterproof cases equipped some of Patek Philippe's most iconic references, including the celebrated references 1463 and 570, the screw-down case belongs to one of the manufacture's rarest water-resistant models. Research indicates that only approximately 20 examples of the stainless steel reference 2509 are known today, making it extraordinary that such an uncommon Patek Philippe case was entrusted to the Geneva Watchmaking School for instructional purposes.
Every major component unmistakably reflects Patek Philippe's own production. The elegant silvered dial was manufactured by Stern Frères, identified by the inscription ★699 43 on its reverse, with the star denoting Stern Frères and the accompanying numbers corresponding to the production order. Powering the watch is the Patek Philippe calibre 12-400, introduced in 1949 as the successor to the calibre 12-200 and distinguished by the addition of Incabloc shock protection. The movement bears the signature of Jean Pierre Curchod, whose work on the jewel setting, anglage, black polishing, Côtes de Genève, and overall finishing demonstrates the exceptional standard expected of Geneva's finest watchmaking students. It is further stamped twice with the prestigious Poinçon de Genève (Geneva Seal), the highest certification of movement finishing and craftsmanship.
Today, Patek Philippe continues to maintain close ties with the École d'Horlogerie de Genève, which celebrated its bicentenary in 2024. Many of the school's graduates have gone on to join the manufacture, perpetuating Geneva's centuries-old tradition of excellence in high watchmaking.
What distinguishes the present timepiece from other École d'Horlogerie creations is the fact that, although the case itself is unsigned, the inside caseback confirms it was originally manufactured as Patek Philippe reference 2509. Produced by the celebrated casemaker François Borgel, whose waterproof cases equipped some of Patek Philippe's most iconic references, including the celebrated references 1463 and 570, the screw-down case belongs to one of the manufacture's rarest water-resistant models. Research indicates that only approximately 20 examples of the stainless steel reference 2509 are known today, making it extraordinary that such an uncommon Patek Philippe case was entrusted to the Geneva Watchmaking School for instructional purposes.
Every major component unmistakably reflects Patek Philippe's own production. The elegant silvered dial was manufactured by Stern Frères, identified by the inscription ★699 43 on its reverse, with the star denoting Stern Frères and the accompanying numbers corresponding to the production order. Powering the watch is the Patek Philippe calibre 12-400, introduced in 1949 as the successor to the calibre 12-200 and distinguished by the addition of Incabloc shock protection. The movement bears the signature of Jean Pierre Curchod, whose work on the jewel setting, anglage, black polishing, Côtes de Genève, and overall finishing demonstrates the exceptional standard expected of Geneva's finest watchmaking students. It is further stamped twice with the prestigious Poinçon de Genève (Geneva Seal), the highest certification of movement finishing and craftsmanship.
Today, Patek Philippe continues to maintain close ties with the École d'Horlogerie de Genève, which celebrated its bicentenary in 2024. Many of the school's graduates have gone on to join the manufacture, perpetuating Geneva's centuries-old tradition of excellence in high watchmaking.