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The Encyclopedia of Horology

Wristwatch · Annual Calendar Flyback Chronograph

Patek Philippe Annual Calendar Flyback Chronograph Reference 5905P-001

Partially verified

This Patek Philippe Annual Calendar Flyback Chronograph, reference 5905P-001, is a wristwatch featuring an annual calendar mechanism and a flyback chronograph complication. The timepiece is housed in a 42mm platinum case and paired with a blue alligator leather strap secured by a platinum buckle. The blue dial includes applied indexes and luminous obelisk-shaped hands, with a date, day, and month display positioned in the upper half. The watch is powered by the automatic caliber CH 28-520 QA 24H, which is visible through a sapphire crystal case back. The annual calendar system, developed by Patek Philippe, automatically accounts for months of varying lengths, requiring manual adjustment only once annually at the end of February. The flyback chronograph function allows for the reset and immediate restart of the timing operation with a single press. The watch is supplied with its original accessories.

Patek Philippe Annual Calendar Flyback Chronograph, reference 5905P-001, featuring a blue dial, platinum case, and blue alligator leather strap.
Patek Philippe Annual Calendar Flyback Chronograph, reference 5905P-001, featuring a blue dial, platinum case, and blue alligator leather strap. — Analog:Shift. Rights pending — permission not yet requested. Original source

Catalogue identity

Source
zamanito.com
Category
Wristwatch · Annual Calendar Flyback Chronograph
Maker / attribution
Patek Philippe
Reference
5905P-001
Catalogue / lot identifier
Source URL identifies the listing
Source-reported date
Not established
Source-reported place
Switzerland

Source-reported attribution and specifications are not independent authentication. A listing does not establish present ownership, current display, availability or permission to reproduce.

Object description

Case and Dial Design

The watch features a 42mm platinum case designed for durability. The aesthetic is anchored by a rich blue dial that incorporates applied hour indexes and a white minute track surrounding the chronograph indicators. The display layout follows a classical Patek Philippe arrangement, with day, date, and month apertures positioned in the upper half of the dial.

The time is indicated by luminous, obelisk-shaped hands, providing a balance between aesthetic presentation and readability. The chronograph function is integrated into the dial, with a small seconds hand positioned above the six o'clock marker. The exterior is finished with a blue alligator leather strap and a matching platinum buckle.

Evidence for this section
  • “این ساعت در یک قاب ۴۲ میلی‌متری از جنس پلاتین جای گرفته است که جلوه‌ای از شکوه و دوام را به نمایش می‌گذارد.”
  • “صفحه ساعت به رنگ آبی غنی است که در نور تغییرات زیبایی نشان می‌دهد و با شاخص‌های اعمال‌شده و یک مسیر دقیقه‌شمار سفید و شفاف که کرنوگراف را در بر گرفته، لنگر انداخته است.”
  • “عقربه‌های درخشان به شکل ابلیسک، ظاهر این ساعت را تکمیل کرده و تعادلی میان خوانایی و زیبایی‌شناسی برقرار می‌کنند.”

Mechanical Complications

The timepiece combines two major complications: an annual calendar and a flyback chronograph. The annual calendar system, which was invented and patented by Patek Philippe in the 1990s, accounts for months of varying lengths, requiring manual adjustment only once per year at the end of February.

The flyback chronograph is engineered for practical use, allowing the user to reset and restart the timing mechanism with a single press of a pusher. This functionality is intended for timing intervals and measuring consecutive events, integrated into the movement with technical precision.

Evidence for this section
  • “این قابلیت که در دهه ۱۹۹۰ توسط Patek Philippe اختراع و ثبت شد، به شکلی ظریف شکاف میان ساعت‌های تقویم ساده و مدل‌های پیچیده تقویم دائمی را پر می‌کند.”
  • “این سیستم با در نظر گرفتن ماه‌هایی با طول متفاوت، تنها یک بار در سال، یعنی در پایان ماه فوریه، نیاز به تنظیم دستی دارد”
  • “رفرنس 5905P-001 این نبوغ را با یک کرنوگراف فلای‌بک (Flyback) ترکیب کرده است که به کاربر اجازه می‌دهد تنها با یک فشار، عملکرد زمان‌سنجی را بازنشانی و دوباره آغاز کند.”

Movement and Accessories

Powering the watch is the automatic caliber CH 28-520 QA 24H. The internal movement is observable through a sapphire crystal case back, which allows for visual inspection of the finishing and construction. The caliber is categorized by the source as representing the brand's approach to high-end horology.

The watch is delivered with its original accessories, completing the full set.

Evidence for this section
  • “با چرخاندن ساعت، کالیبر اتوماتیک CH 28-520 QA 24H از طریق قاب پشتی یاقوت کبود نمایان می‌شود”
  • “این مدل با یک بند چرم تمساح آبی رنگ و سگک پلاتینی همراه است و با مجموعه کامل لوازم جانبی اصلی خود عرضه می‌شود.”

Open research questions

  • Does the watch include the original warranty certificate or factory service history?
  • What is the specific production year for this reference 5905P-001?

Source evidence

Recorded claims and source quotations for Patek Philippe Annual Calendar Flyback Chronograph Reference 5905P-001
FieldSource-reported valueSource quotation
MakerPatek Philippe“برند: Patek Philippe”
Reference5905P-001“رفرنس: 5905P-001”
Case materialPlatinum“جنس قاب: پلاتین”
Case diameter42mm“قطر قاب: 42 میلی‌متر”
CaliberCH 28-520 QA 24H“کالیبر: CH 28-520 QA 24H”
Dial colorBlue“رنگ صفحه: آبی”
Strap materialAlligator leather“جنس بند: چرم تمساح”

Visible details

  • Blue dial with applied hour markers
  • Three calendar apertures located at the top of the dial
  • Platinum case featuring rectangular chronograph pushers
  • Blue alligator leather strap with a platinum pin buckle

Research qualifications

  • The source provides no serial number for identification
  • The source does not specify the manufacturing date of this unit

Photograph identity and source facts were screened before import; rights clearance remains pending.

Consulted source

ساعت Patek Philippe Annual Calendar Flyback Chronograph رفرنس 5905P-001

Reviewed 2026-11-02 · Record aac47366bb

Terms in this record

Glossary explanations for terms named in this object’s record.

Other annual calendar flyback chronograph records