Patek Philippe
Annual Calendar Flyback Chronograph Steel
5905/1A-001
Patek Philippe's annual calendar and flyback chronograph united in steel.
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Overview
The Patek Philippe reference 5905/1A-001 brings together two of the manufacture's most refined complications — the flyback chronograph and the annual calendar — within a 42 mm stainless steel case. Its olive green sunburst dial gives the piece a distinctly contemporary character that sets it apart from the more traditional precious-metal variants in the Complications line. Calibre CH 28-520 QA 24H, developed and finished entirely in-house, drives both the high-frequency chronograph and the calendar mechanism.
History
The 5905 family was introduced to extend Patek Philippe's annual calendar chronograph offering into steel, a material the manufacture had historically reserved for sportier references. The 5905/1A-001 variant, with its olive green dial, arrived in the early 2020s and quickly attracted attention from collectors drawn to the combination of a dressy complication and a contemporary dial colour. Steel Patek Philippe Complications references have historically commanded strong collector interest, as the manufacture produces them in comparatively modest numbers relative to its precious-metal output.
Notable points
- Calibre CH 28-520 QA 24H integrates a flyback chronograph with an annual calendar and a 24-hour day/night indicator in a single in-house movement.
- The annual calendar mechanism requires only one manual correction per year, at the end of February, distinguishing it from a simple triple-calendar.
- The olive green sunburst dial — a shade that gained broad collector traction in the early 2020s — is paired with applied hour markers and a steel case for a modern aesthetic.
- At 42 mm, the case is among the larger diameters in Patek Philippe's Complications portfolio, accommodating the layered calendar and chronograph subdials.
- Stainless steel references in the Patek Philippe Complications line are produced in limited quantities relative to gold variants, historically making them sought-after among collectors.
Specifications
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