A Patek Philippe carries three numbers, and only one of them dates the watch. The movement number is the one that matters: Patek has numbered movements sequentially since 1839 and recorded every one in its own archive, which makes it the most complete production record in watchmaking. Enter yours in the lookup below for an estimated period. The reference number, something like 5711/1A-010, describes the model rather than the individual watch, and the decoder further down takes it apart. Everything else is here too: the movement chart, the case number, material and dial codes, calibres, and what to do when the number stops being readable, which on a modern Patek it does.

The three numbers on a Patek Philippe

Most brands use two numbers. Patek uses three, and mixing them up is the commonest mistake made when buying or selling one. Each answers a different question.

The practical consequence is that a Patek does not show you much from the outside. Patek engraves its numbers internally, which is worth knowing in itself: a serial number on the outside of the case is a Rolex habit, not a Patek one. Getting at the movement number on a solid-back watch means a watchmaker with the right tools, so on most watches the reference number and the paperwork are where you start.

Patek Philippe movement number chart

Match the movement number against the chart. The nineteenth and early twentieth century entries are well attested and cross-checked, and they mark roughly where each year's production began.

Those anchors hold up. What comes after 1925 does not work the same way, and any page presenting the modern era as a clean year-by-year table is overstating what the data supports.

The modern eras

From the 1930s the numbers stop running in a single line. Patek issued blocks by calibre rather than strictly by date, so a band covers a period rather than a year. Read the table below as eras.

Where the chart stops working

Three moments explain most of the confusion when dating a Patek by its movement number.

The 1930s gap. After roughly 202,000 in the late 1920s the numbers appear to jump into the 700,000s. Nothing is missing. Patek was running several calibre batches at once, so watches numbered between about 700,000 and 980,000 were made across the 1930s, 1940s and 1950s depending on which calibre they carry. A number in that band narrows a watch to an era and no further.

The move to three million. In the mid 1990s, with the calibre 315, Patek opened an entirely new block starting around 3,000,000. A watch from that period can carry a number in the high two-millions or a number starting with three, depending on the movement inside it. Both are normal.

2009 and the five-million block. Patek introduced its own Seal in 2009, replacing the Geneva Seal, and opened the five-million block at the same time. A movement in that block should carry the Patek Philippe Seal rather than the Geneva Seal, which is a useful cross-check. From around then Patek also began skipping blocks on purpose, so buyers could not read a production year off the number. Sources disagree on exactly when the skipping started, placing it somewhere between 2009 and the middle of the 2010s.

The honest summary: the chart works well for vintage, works as an era guide through the twentieth century, and stops working for anything recent.

Case number versus movement number

The case number is stamped inside the caseback. On an original watch it should agree with the movement number, and the two together are part of what makes a Patek worth what it is worth.

They do not always agree, and a mismatch is not automatically a problem. Patek's own service centres have replaced movements over the years, and a replacement movement carries its own number. What matters is whether the mismatch is documented. An undocumented one needs explaining before anything else happens.

There is a second difference worth knowing. The movement number records when the movement was made. The case number sits closer to when the finished watch actually left the factory, because movements could be made in batches and cased later. For placing a watch in Patek's production chronology, the case number is often the better guide of the two, which is the opposite of what most guides say.

Patek Philippe reference numbers explained

The reference number describes the model, not the individual watch. Every steel Nautilus with that dial carries 5711/1A-010, and each of them has its own movement and case number underneath.

Collectors use the first four digits in conversation and say "a 5711" or "a 5167". The full reference is what you need to identify the exact variant, because the material letter and the dial code are doing real work.

The anatomy of a reference

The modern format is a four-digit model code, then an attribute code and a material letter after the slash, then a dial iteration after the dash.

Two cautions. Vintage references from before the 1970s are often just three or four digits with nothing after them, so the decoder falls back to identifying the model alone. And Patek has never published a position-by-position guide, so the digit patterns below are tendencies drawn from the catalogue rather than rules the company has confirmed.

Patek Philippe reference decoder

Enter a full reference or just the four-digit model code. If it is in the database you get the collection, the production window and the nickname. If it is not, the tool reads the structure and says so.

The first digit

The first digit sorts the catalogue roughly into men's and ladies' references, and hints at the generation.

Collection ranges

The second digit tends to signal the collection. Tendencies, not rules, and there are documented exceptions in both directions.

Material letters

The letter gives the case material, in abbreviated French.

Attribute codes

The code between the slash and the material letter describes how the watch is worn and, on some references, how it is finished.

Dial codes

The three digits after the dash are the dial iteration, numbered in sequence rather than by colour. The same code means different things on different references.

Patek Philippe reference database

Search by reference, collection or nickname, or filter by family. Ninety-nine references from the 1932 Calatrava to the 2024 Cubitus, each with its production window. On a modern Patek the window is frequently the most precise dating you will get without paying Patek for an extract.

Patek Philippe calibres

Calibres have their own production periods, which makes the movement a cross-check on any claimed date. On a watch with a sapphire caseback you can read it without opening anything.

Patek Philippe nicknames

Patek uses none of these officially. They are how the watches get discussed and searched for anyway.

The Extract from the Archives

Patek Philippe keeps records of every watch it has made since 1839, and will issue the owner of any Patek more than five years old an Extract from the Archives.

The extract states the movement number, the case number, the reference, the case material, the dial, the bracelet or strap, and the production date recorded in Patek's own books. It also confirms whether the movement and case left the factory as a pair, which is the thing no chart on this page can tell you.

It is ordered from Patek directly or through an authorized retailer, it carries a fee, and it takes several weeks. For a watch of any real value it is standard, and its absence is a fair thing for a buyer to raise.

What a serial number cannot tell you

A movement number identifies one movement and suggests when it was made. That is the whole of what it does.

It does not establish that a watch is genuine. Patek publishes no database the public can query, numbers copied from real watches turn up on counterfeits, and a number says nothing about whether the dial, hands, case and movement belong together. Patek is among the most counterfeited names in watchmaking, which is exactly why a number that looks right on a chart settles very little on its own.

What holds up is agreement between things. A movement number and a case number that match, a reference that matches the watch in front of you, a calibre that fits the reference, and paperwork that agrees with all of it. Any one of those alone is not much.

Every watch Watch The Throne Timepieces sells is 100% authentic, with no knockoffs. Call or text us for details.

Glossary

The terms that come up most often when identifying or dating a Patek Philippe.

Movement number

The number engraved on the movement. Patek's primary production record, sequential since 1839.

Case number

The number stamped inside the caseback, identifying the cased watch. Should match the movement number on an original.

Reference number

The model code. Four digits plus an attribute code, a material letter and a dial iteration.

Extract from the Archives

Patek's official certificate stating a watch's original specification and production date from its own records.

Patek Philippe Seal

Patek's own quality standard, introduced in 2009 in place of the Geneva Seal. Covers the finished watch.

Geneva Seal

The Genevan quality hallmark Patek used until 2009. Its presence dates a movement to before then.

Calibre

The movement. Patek identifies each by number and each has its own production period.

Calatrava cross

The four-armed cross that has been Patek's emblem since 1887.

Officer's case

A case with a hinged cover over the back, as on the 5153 and 5524.

Guilloche

Engine-turned dial decoration, cut rather than stamped on Patek dials.

Grand Feu enamel

Enamel fired at high temperature, used on Patek's most expensive dials.

Complication

Any function beyond hours, minutes and seconds.

Perpetual calendar

A calendar that accounts for month lengths and leap years without adjustment.

Annual calendar

A calendar that needs correcting once a year, at the end of February. Patented by Patek in 1996.

Tourbillon

A rotating carriage holding the escapement. Patek does not display it on the dial of most references.

Box and papers

The original packaging and Certificate of Origin. On a Patek the papers carry the reference and both numbers.

Complete set

The watch together with its box, papers and accessories.

Unworn

Never worn. Not the same as new from an authorized dealer.

Frequently asked questions

How do I find the serial number on a Patek Philippe?

Patek engraves its numbers inside the watch. The movement number is on the movement plate or a bridge, readable through a sapphire caseback or by a watchmaker opening a solid one. The case number is stamped inside the caseback. Nothing is engraved on the outside of the case.

What year was my Patek Philippe made?

Use the movement number. For watches up to the 1920s the chart on this page gives a close estimate. Through the twentieth century it gives an era rather than a year, because Patek issued numbers in calibre blocks. For anything made in roughly the last fifteen years, only an Extract from the Archives gives a production year.

What is the difference between the movement number and the case number?

The movement number identifies the movement and is Patek's primary production record. The case number identifies the cased watch and sits closer to when it actually left the factory. On an original, unserviced watch the two should agree.

My movement and case numbers do not match. Is the watch fake?

Not necessarily. Patek service centres have replaced movements over the years, and a replacement carries its own number. A documented mismatch is explainable. An undocumented one needs resolving before a sale, and it affects what the watch is worth.

Does Patek Philippe have a public serial number database?

No. Patek keeps complete records but does not publish them. The Extract from the Archives is how an owner gets at that record, and it is issued by Patek rather than looked up online.

What is an Extract from the Archives?

Patek's official historical certificate for a watch. It states the movement number, case number, reference, materials, dial, strap or bracelet and the production date from Patek's own records, and confirms whether the movement and case are an original pair. Available for any Patek more than five years old.

How do I read a Patek Philippe reference number?

Four parts. A four-digit model code, an attribute code after the slash, a material letter, and a dial iteration after the dash. So 5711/1A-010 is the Nautilus, on a metal bracelet, in steel, second dial version.

What does the A mean in 5711/1A?

Acier, French for steel. The material letters are A steel, G white gold, J yellow gold, R rose gold, P platinum and T titanium.

What does the /1 mean in a Patek reference?

An integrated metal bracelet. A reference without it, such as 5167A, is usually on a strap.

What do the last three digits of a Patek reference mean?

The dial iteration, numbered in sequence. The -001 is the first dial released for that reference and -010 the second. The numbers are not tied to colours, and Patek skips numbers for limited editions, which is why the 5711 has a -014 and a -018 with nothing in between.

Which reference is the Tiffany Nautilus?

5711/1A-018, the Tiffany blue dial released in 2021 in a run of 170 pieces, marking the retailer's long relationship with Patek.

Which reference is the green Nautilus?

5711/1A-014, the olive green dial released in 2021 in the final year of the steel 5711.

When was the Nautilus 5711 discontinued?

Patek ended production of the steel 5711 in 2021. The 5811/1G in white gold arrived in 2022 as the successor, at 41mm rather than 40mm.

What is the original Nautilus reference?

The 3700/1A, designed by Gerald Genta and released in 1976. Collectors call it the Jumbo because 42mm was very large for the period.

What is the difference between the Aquanaut 5167 and 5168?

Case size mainly. The 5167 is 40mm and the 5168 is 42mm. Both carry the embossed Aquanaut dial pattern and the composite strap.

What is the Patek Philippe Seal?

Patek's own quality standard, introduced in 2009 to replace the Geneva Seal. It covers the finished watch rather than just the movement. A movement made from 2009 onward should carry the PP Seal, which is a useful cross-check on a claimed date.

Why do Patek movement numbers jump from 200,000 to 700,000?

Because the sequence stopped being a single line. From around 1930 Patek ran several calibre batches concurrently and assigned number blocks to each, so watches numbered between roughly 700,000 and 980,000 were made across three decades depending on the calibre.

Can I date a Patek without opening the case?

Only partly. The reference number gives you the production window of the model, which is often enough. The individual watch's year needs the movement number, which means a sapphire caseback, a watchmaker, or the paperwork.

Is the serial number proof that a Patek Philippe is real?

No. There is no public database to check it against, counterfeits copy real numbers from documented watches, and a number says nothing about whether the parts of the watch belong together. Dating and authentication are separate questions.

What if my Patek has no box or papers?

The reference gives the production window, the calibre narrows it, and the movement and case numbers place it in the chronology. Beyond that, an Extract from the Archives is the route to a confirmed date and an original specification.

Who buys and sources Patek Philippe in Louisiana?

Watch The Throne Timepieces works with Patek Philippe from Baton Rouge and across Louisiana, including New Orleans, Lafayette, Prairieville and Gonzales, as an independent specialist rather than an authorized dealer. Patek is handled as a sourcing line: tell us the reference you want and we find it.

Sourcing or selling a Patek Philippe