Patek Philippe Annual Calendar Chronograph 5905/1A-001 | SS | Green

A Legacy of Annual Calendar Mastery

Patek Philippe’s reference 5905/1A-001 is a modern exemplar of the Maison’s defining contribution to calendar mechanics: the Annual Calendar. Marrying the clever economy of the 1996 annual-calendar patent with an integrated flyback chronograph, this stainless‑steel 42 mm presents a compact lineage of innovation in a striking green guise.

The Hallmarks of a Patek Philippe Signature

• Reference Number: 5905/1A-001
• The Signature Complication: Annual Calendar (day, date, month) combined with a flyback chronograph
• The Calibre’s Lineage: Calibre CH 28‑520 QA 24H — Patek Philippe’s automatic column‑wheel chronograph with annual‑calendar module and vertical clutch
• Case Material and Diameter: Stainless steel, 42 mm
• Dial Style: Green sunburst dial with day and month apertures, chronograph counter and applied baton indices
• The Patek Philippe Seal: Yes

The acquisition of an Annual Calendar is an embrace of mechanical civility — a movement that intuitively knows the months and spares its keeper an extra adjustment each year. Here, that refined logic is married to a modern chronograph, creating technical harmony without theatricality.

The Ultimate Heirloom of Innovation

This 5905/1A-001 is more than a contemporary sports‑dress watch; it is a chapter in Patek Philippe’s ongoing story of practical ingenuity. Its annual calendar is a direct line back to the Maison’s 1996 breakthrough, while the integrated chronograph keeps the whole composition purposeful and wearable — an object equally at home in a boardroom or a private salon. As a living heirloom, it offers both historical significance and daily grace.

This Watch is Ideal For…

• The history enthusiast who collects horological milestones tied to Patek Philippe’s patents.
• The discerning owner who desires a technically sophisticated yet eminently wearable daily companion.
• The steward seeking an heirloom that unites innovation, restraint, and modern elegance.